Update OOjs UI to v0.1.0-pre (466a8762ac)

New changes:
466a876 [BREAKING CHANGE] Make content isolation optional

Update changes:
* Use this.$content instead of this.frame.$content
* Update CSS to no longer reference oo-ui-frame
* Configure window managers to isolate windows, ensuring there is no
  effective change to VisualEditor's use of dialogs
* Remove OO.ui.Frame from categories.json

Change-Id: Ie645e097c4ae3a1a499d826b4b2805488173ccdb