Update VE core submodule to master (0facbc0)

New changes:
cc657c4 Add keyboard shortcuts for strikethrough and code annotations
7d7f803 build: Bump miscellaneous devDependencies to latest
6de5bbf Update OOjs UI to v0.1.0-pre (49b64bdba7)

Change-Id: Iba45cd1382fdb2070093058252e0e2dcb7442c76