Try to follow eve7 example,

Scoping in JavaScript allowes same variables names, but let change name

Now Component.js and mainfest.json are used to configure libs, css, main
application and top view.

Some minor parts are not yet working (like routing and css), but main
application is runs!

It enabled automatically when c++14 or c++17 are enabled.
But one could disable compilation of many components if not needed.
Also when disabled, openui5 files are not copied into build and not
installed 

Also, when http is disbaled, jsroot not copied into build and not
installed

Websocket handler can allow to access file from local system, where main
HTML page is located.

Basic eve7 demo works, some extra functionality need to be done

Need to set correct dependency for JSROOT modules as well

Under this directory all views, controllers, css and html files will be
collected. They could be addressed with "rootui5" namespace in OpenUI 

Use new locations

Now default location for JSROOT is <prefix>/js
For Openui5 files is <prefix>/ui5

etc was not appropriate place, one need to provide rules to install
JSROOT and OPENUI5 in <prefix> directory

Use better C++ syntax, 
Avoid use of gEeve - it has to disappear in the future

In the files TAttFill, TAttLine, TAttMarker and TAttText reference is made to a
flag to set in `$ROOTSYS/etc/system.rootrc` to enable transparency. In
`system.rootrc` the flag is `openGL.CanvasPreferGL` not
`flagOpenGL.CanvasPreferGL`. This commit moves the word "flag" outside the
backticks in the comments in the source files.

The right name is CMAKE_VERBOSE_MAKEFILE in any case, and
the other variable is set to override the default on a per
directory basis.

Cppyy does not automatically add to a class the method overloads that
come from a 'using' statement. For this reason, a pythonisation is
needed for RooDataHist to see the overloads it is using from
RooAbsData.