From Evgueni Tchernaiev: The order of drawing has been corrected in TPainterAlgorithms::LegoCartesian().
Some clean up has also been done.

- small improvement in DrawFaceMode2();
- fix of the order of drawing and clean up in SurfaceCartesian();

From Evgueni Tcherniaev: modify the code for WCtoNDC() and NDCtoWC() to ensure that the transformations work correctly in the case where pw and pn are the same array.

Spell check

Spell check

Previous if the user did (implicitly or explicitly)
  - load first dictionary for a class (without a rootpcm)
  - access the TClass for that class
  - load a second dictionary (with a rootpcm) for the same class
  - Request the list of data members or the list of base class
    for that class.
then the pointer to either list was a nullptr (rather than a
pointer to the proper list as provided by the first dictionary).

Move locking in the caller which can mutate interpreter's state. Constify.

Revert "SetArguments calls reset arg list first. We don't want this when we pass a template parameter pack."

This introduced an issue. We really need to reset the elements every time we
send a signal.

Fixes the reported issues.

This reverts commit 2c3becf7.

Fix atexit function declarations for gcc and add test. Fix mangling issues for at_quick_exit and g++ headers.

Implement atexit override. Windows uses atexit is to drive invoke static destructors, and using atexit on other platforms will cause cling to crash.

Fix a segmentation violation when closing a detached TEveGedEditor, for example:
cd $(ROOTSYS)/root/tutorials/eve
root geom_atlas.C
<click on blue GLViewer [TGLSAViewer]>
<window de-attaches>
<click the window decoration to close window>
Root >
*** Break *** segmentation violation

This reverts commit f1538c4f304f470b8e24c4fc55f5724264427397.