VE-654: rename ve-ui classes to oo-ui
VE-654: ButtonWidget -> PushButtonWidget
VE-654: fix media insert dialog search input not appearing.
VE-654: fix icons
VE-654: fix popup widgets
VE-654: fix add media button styles
VE-654: fix collapsing dialog menus
VE-654: add white versions of new icons.
VE-654: fix toolbar config for Reference dialog.
VE-654: fix inspectors
VE-654: add white version of picture icon.
VE-654: fix WikiaArticle styles inside dialogs.
Revert "VE-654: fix toolbar config for Reference dialog."

This reverts commit 36731f86ef631ba03ff849dc683e044de0379831.
VE-654: fix reference dialog tools; also fix organization of our dialog tools while I'm at it.
Merge branch 've-upstream-merge' into style-fixes

Conflicts:
	extensions/VisualEditor/wikia/modules/ve/init/ve.init.mw.WikiaViewPageTarget.js
VE-654: move changes from core to our files.
VE-654: fix search result plus/check icons.
Merge branch 've-upstream-merge' into style-fixes
VE-654: make source editor styles match with the dialog.
VE-654: fix highlight/selected color of options in search.