Switch to processes for windows (dialogs/inspectors)
This conversion also required the splitting of MWLinkInspector into
MWLinkNodeInspector and MWLinkAnnotationInspector.
New changes:
88fe25f [BREAKING CHANGE] Update OOjs UI to v0.1.0-pre (dd888aba5c)
Change-Id: I662d8985463c9fc881775f70aef87ebeb454a73f