- Remove strict flags from files, which are using FFmpeg stuff We're still using some symbols which are marked as deprecated. Ideally, we shall switch to new API, but it's a bit larger challenge because we don't want to break compatibility withotu actual need. - Replace MAKE_ID with BT_MAKE_ID in bullet library. This is needed to prevent re-definition of MAKE_ID in bullet library. Seems it's only used to read blender files, so should be quite safe change.