Summary: @public The make current RCTShadowView support RTL layout. 1 Change all left/right to start/end for margin, padding, boarder and position 2 Calculate position in the same way as margin, padding and boarder Reviewed By: fkgozali Differential Revision: D3619292 fbshipit-source-id: eaaa6faeee93c964d59bb6f498d89effc09ed567