Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  aff527a20b1dd139487bfe3360b753cf4f87f721

Update OOJS UI to v0.1.0-pre (d047752ccc)

Also, as OOjs UI's StackPanelLayout was renamed to StackLayout, and the
showItem() function to setItem(), fix uses in VisualEditor.

Change-Id: If153e5e7c3a7c60e3d62e20aac8fabd4eaaa73c2