In many places incldues are not required for the dictionary generation, 
therefore target_include_directories can be used 

Now that ROOT_GENERATE_DICTIONARY() knows how to pick up includes
and compile definitions from the library targets even when added
later with target_link_libraries() and target_include_directories(),
we can remove extra includes added by hand as a workaround before.

Moved TPDGCode.h (used in 'pythia6' and 'pythia8') from 'vmc' to to 'eg'; this makes all other libraries in 'montecarlo' not dependent on 'vmc'

A plain include_directories() was meant to be converted
into target_include_directories() in the previous commit,
but the second part was missing.

This refactors the CMake build files to no longer manually call
the CMake functions for generating and linking the dicionairies.
One reason is to reduce boilerplate, the other is that it is now
no longer possible to have naming mismatches between the dictionary
generation arguments and linking function arguments which was causing
the race conditions we had in our build system.

This also now follows more strictly the separation between dependencies
like Math, Tree and Core and pure linking flags to external libraries.

The naming of the library in the two function calls ROOT_GENERATE_DICTIONARY
and ROOT_LINKER_LIBRARY was often not matching. This causes that
ROOT_LINKER_LIBRARY couldn't correctly set its dependencies to the output
file of ROOT_GENERATE_DICTIONARY and therefore causes race conditions in
the build system.

Note: We're attached all dependencies to a custom target, and
NOT to the output files generated by rootcling. This should mitigate
the race conditions we experience when multiple targets in different
Make jobs request the same output file as a dependency and then
suffer from this Make problem that is described here:
https://cmake.org/Bug/view.php?id=10082

This patch also adds a (commented out) piece of code that can print
warnings if we don't have a fitting G__*.cxx file for a
ROOT_LINKER_LIBRARY call. This is sometimes intended, so I didn't
enable this warning by default. We should enable this code
by default in the future once we have a way to express if we
intentionally don't provide the G__*.cxx file when calling
ROOT_LINKER_LIBRARY.

ROOT_GENERATE_DICTIONARY allows to specify dependencies, but we currently
don't actually specify those. As we need this for getting the module
dependencies right (as we can't build missing modules on demand), we should
add those dependencies here. Then those dependencies propagate to the
rootcling invocation which will in the future also generate the C++ module
for the selected dictionary.

ClassImp is a macro defined in Rtypes.h. It can be written without trailing
semicolon. However, clang-format is based on lexing and it doesn't know at
all about preprocessors and how to expand macros. When visiting ClassImp(X)
it thinks this is not a completed entity (as it doesn't expand macros) and
considers the next line as continuation of the previous.

Inserting a semicolon fixes the issue and makes formatting with clang-format
in the ROOT codebase less tricky.

Make cannot deal with 'export *', they have to be escaped and fixed later on.

This is the recommended way of using the modules feature and should pave our way
of enabling -fmodules-local-submodules-visibility mode.

Our two build systems can generate almost entirely a modulemap file laying out
one module per library. Due to some non-modular implementation in ROOT's core we
still need to treat some header files specially.

This patch appends modular header files to the modulemap while skipping the
predefined ones. Configure-make relates all headers that are installed in
$ROOTSYS/include to their library whereas relates only headers which are part of
library's dictionary.

Conflicts:
	bindings/pyroot/src/MethodProxy.cxx
	cmake/modules/RootConfiguration.cmake
	etc/http/files/main.htm
	etc/http/files/single.htm
	geom/geompainter/src/TGeoChecker.cxx
	graf2d/mathtext/inc/mathtext.h
	graf2d/mathtext/src/fontembed.cxx
	graf2d/mathtext/src/fontembedps.cxx
	graf2d/qt/inc/TQtCanvasPainter.h
	gui/qtgsi/src/TQRootCanvas.cxx
	hist/hist/src/TBackCompFitter.cxx
	hist/hist/src/TEfficiency.cxx
	hist/hist/src/TFractionFitter.cxx
	hist/hist/src/TGraphAsymmErrors.cxx
	hist/hist/src/TH2.cxx
	hist/hist/src/TH3.cxx
	hist/hist/src/TMultiDimFit.cxx
	hist/hist/src/TProfile.cxx
	hist/hist/src/TProfile2D.cxx
	hist/hist/src/TUnfoldBinning.cxx
	html/src/TDocParser.cxx
	math/foam/src/TFoam.cxx
	math/genvector/inc/Math/VectorUtil_Cint.h
	math/minuit2/inc/Minuit2/FumiliMaximumLikelihoodFCN.h
	math/minuit2/inc/Minuit2/FumiliStandardChi2FCN.h
	math/minuit2/inc/Minuit2/FumiliStandardMaximumLikelihoodFCN.h
	math/minuit2/inc/Minuit2/StackAllocator.h
	math/minuit2/src/TChi2ExtendedFCN.cxx
	math/minuit2/src/TChi2FCN.cxx
	math/minuit2/src/TFitterMinuit.cxx
	math/minuit2/src/TFumiliFCN.cxx
	misc/table/src/TTableDescriptor.cxx
	net/auth/src/rsaaux.cxx
	test/QpRandomDriver.cxx
	test/ios/RootBrowser/Src/Browser/Controllers/FileCollectionViewController.mm
	test/ios/RootBrowser/Src/Browser/Controllers/FileContentViewController.mm
	test/ios/RootBrowser/Src/Browser/Controllers/ObjectViewController.mm
	test/ios/RootBrowser/Src/Browser/Views/PadView.mm
	test/ios/RootBrowser/Src/CustomUI/RangeSlider.mm
	test/ios/RootBrowser/Src/ObjectInspector/Controllers/AxisFontInspector.mm
	test/ios/RootBrowser/Src/ObjectInspector/Controllers/AxisInspector.mm
	test/ios/RootBrowser/Src/ObjectInspector/Controllers/AxisLabelsInspector.mm
	test/ios/RootBrowser/Src/ObjectInspector/Controllers/AxisTitleInspector.mm
	test/ios/RootBrowser/Src/ObjectInspector/Controllers/FilledAreaInspector.mm
	test/ios/RootBrowser/Src/ObjectInspector/Controllers/H1BinsInspector.mm
	test/ios/RootBrowser/Src/ObjectInspector/Controllers/H1ErrorsInspector.mm
	test/ios/RootBrowser/Src/ObjectInspector/Controllers/H1Inspector.mm
	test/ios/RootBrowser/Src/ObjectInspector/Controllers/InspectorWithNavigation.mm
	test/ios/RootBrowser/Src/ObjectInspector/Controllers/LineInspector.mm
	test/ios/RootBrowser/Src/ObjectInspector/Controllers/MarkerInspector.mm
	test/ios/RootBrowser/Src/ObjectInspector/Controllers/ObjectInspector.mm
	test/ios/RootBrowser/Src/ObjectInspector/Controllers/PadInspector.mm
	test/ios/RootBrowser/Src/ObjectInspector/Controllers/PadTicksGridInspector.mm
	test/ios/Tutorials/PadOptionsController.mm
	test/ios/Tutorials/PadView.mm
	test/periodic/NdbMF.cxx
	test/periodic/NdbMTReacDesc.cxx
	test/periodic/NdbMTReactionXS.cxx
	test/periodic/NdbParticleList.cxx
	test/periodic/XSGui.h
	test/stressLinear.cxx
	test/stressRooFit_tests.cxx
	test/tcollbm.cxx
	test/vmatrix.cxx
	tutorials/eve/boxset.C
	tutorials/geom/geodemo.C
	tutorials/graphs/splines.C
	tutorials/hist/th2polyEurope.C
	tutorials/mc/CompareMasses.C
	tutorials/memstat/memstat.C

rootcling will write out ROOT files; that does not work for libCore and RIO
which instead use rootcling_tmp.
All other libraries use rootcling -rootbuild.
Rename ROOTCLINGTMP to ROOTCLINGSTAGE1; rootcling -rootbuild is ROOTCLINGSTAGE2.

By Thomas Ruf.

now the library names in the rootmaps are sane.
In addition, the creation of the tmva and genvector dicts was
simplified.

mechanism which does not involve rlibmap anymore but
rootcling instead.
Basically all the calls to the macro calling rlibmap have been
removed.

Signed-off-by: Danilo Piparo <danilo.piparo@cern.ch>
Signed-off-by: Fons Rademakers <Fons.Rademakers@cern.ch>

which happens through rootcling and not anymore through rlibmap.

Signed-off-by: Danilo Piparo <danilo.piparo@cern.ch>
Signed-off-by: Fons Rademakers <Fons.Rademakers@cern.ch>