Uses the new structure agreed upon in #6157, but the thirdparty/ folder
does not behave following a logic similar to that of modules/ yet.
The png driver can't be moved to a module as discussed in #6157, as it's
required by core together with a few other ImageLoader implementations
(see drivers/register_driver_types.cpp:register_core_driver_types())
Dropped the possibility to disable PNG support, it's a core component
of Godot.
(cherry picked from commit 5fef84a135)
Warning: libpng 1.6 is strict about iCCp chunks being incorrect,
solution is to fix the profile. On *nix ImageMagicks "convert" works
on windows optiPNG.
-=-=-=-=-
-Fixed problem with scaling shapes (#827), related to not taking scale in consideration for calculating the moment of inertia
-Added support for multiline strings (or comments) using """
-Save subscene bug, properties not being saved in root node (#806)
-Fix Crash in CollisionPolygon2DEditor (#814)
-Restored Ability to compile without 3D (#795)
-Fix InterpolatedCamera (#803)
-Fix UV Import for OBJ Meshes (#771)
-Fixed issue with modifier gizmos (#794)
-Fixed CapsuleShape gizmo handle (#50)
-Fixed Import Button (not properly working in 3D) (#733)
-Many misc fixes (though no new features)
