* Remove AppDelegate memory leak from Android projects
AppDelegate object and all its members are never released.
As a solution I propose to use static unique_ptr that could destroy it
at the end of the application.
Issue:
https://github.com/cocos2d/cocos2d-x/issues/14110
* Correct code style in Android main.cpp files
- removed redundant headers (reduced dependencies)
- removed redundant code
- corrected code style
* fix: collection of vr fixes
Node: additionalTransform() has its own dirty variable
VR: disabling VR works as expected
VR: works with camera3d test
VR: iOS Tracking works even if it doesn't have any input
fix: setNodeToParentTransform() and setAdditionalTransfrom() work...
...at the same time.
Also, this PR makes the size of Node smaller. `_additionalTransform` is
no longer an inline object.
Instead, it is allocated on demand making 99% of the Nodes smaller by 60
bytes.
fix: compile in windows
* doc: documentation for this fix