Update git submodules
- Update extensions/VisualEditor from branch 'REL1_36' to 9c0b4cfa93c7691fe8ff9f0e827cdc6adc120a3d
- Remove skinning modules when showing preview
Bug: T185284 Change-Id: Ifec8809cd75cb76c79936a69351be0c7779de39e (cherry picked from commit 2fd09aaba39a8cbccff4d7159d2e51a294605426)
- Remove skinning modules when showing preview