* For the T48988 fix (i.e. separate Ease In/Out properties for Bendy Bones in Edit vs Pose modes), old animation data needed to be patched to use the new property names. This is needed to partially fix some of the issues in T53356 (though the Rigify code itself still needs to be patched). * For the T52009 fix, old files needed to have the frame_start and frame_end properties on the FModifier (base-class) updated to match that of the FMod_Stepped type-specific class. This wasn't done in the earlier commit since it wasn't worth going through all animation data just for the sake of updating these relatively-rare settings, but since we're doing it anyway now, it makes sense to include this here.