It was Godot-ified and integrated into Tween originally (#628)
without mention that it was thirdparty code, but it's actually
derived from https://github.com/jesusgollonet/ofpennereasing.
It's also very bad quality code and should be replaced by a better,
properly-maintained library of easing equations.
Done with `autopep8 --select=E7`, fixes:
- E701 - Put colon-separated compound statement on separate lines.
- E702 - Put semicolon-separated compound statement on separate lines.
- E703 - Put semicolon-separated compound statement on separate lines.
- E711 - Fix comparison with None.
- E712 - Fix (trivial case of) comparison with boolean.
- E713 - Fix (trivial case of) non-membership check.
- E721 - Fix various deprecated code (via lib2to3).
-=-=-=-=-=-=-=-=-=-=
Build System:
-Big clean up of SCons, changed how builds are done to a much cleaner method (check the Github Wiki for instructions).
-Deactivated BlackBerry10 (sorry), if no mantainer found (or BlackBerry does not send us a Passort ;), platform will be removed as we have no longer devices to test.
Engine:
-Removed deprecated object and scene format (was in there just for compatibility, not in use since a long time).
-Added ability to open scenes even if a node type was removed (will try to guess the closest type).
-Removed deprecated node types.
