VE-1426: Draggable, overlayless translusion dialog
Added TODO message about mixin idea
Merge branch 've-sprint-25' into VE-1426

Conflicts:
	extensions/VisualEditor/lib/ve/modules/ve/ui/ve.ui.Dialog.js
	extensions/VisualEditor/modules/ve-mw/ui/dialogs/ve.ui.MWTransclusionDialog.js
Merge pull request #4555 from Wikia/VE-1426

VE-1426: Draggable, overlayless translusion dialog