Update VisualEditor to latest 1.23wmf11 for cherry-picks

* 6e94f22 - (wmf/1.23wmf11) Add placeholder for gallery editor
* 68ab801 - Add tagName to ve.dm.MWGalleryNode
| * bcadeaf - Don't throw JS errors when opening MWExtensionInspector on the wrong node type
* 6f37b46 - Only show non-anchored resize handles for MWBlock/InlineImages

Change-Id: I4972092eddd634e42873ca8e55a161a5f02b3e22