Revert "Build: Added .gitattributes"

This reverts commit 7feabdef2d84dc8819ec290c5614d4d6649230ae.
AnimationComplete: Add transition, fallbacks and remove memory leaks

Also no its own module including support tests for animations and
transitions

Fixes gh-5156
Fixes gh-6816
Fixes gh-6697
Fixes gh-6895
Fixes gh-6148
Closes gh-7001