Update VE core submodule to master (beb5e43)

New changes:
3349216 Bold/italic icons for fa
e1d8ebd Add oojs-ui-apex.css to modules.json
beb5e43 Update OOjs UI to v0.1.0-pre (8b13d2b7f7)

Change-Id: I6f46569ed7a95273c72f9629e02f7d7a3fbf4870