Objectives:
* Associate models with tools, rather than dialogs and inspectors
* Move tool/model association utilities to ve.ui.ToolFactory
* Obliterate the view registry
Notes:
The only special case for leaving modelClasses definitions in place is
for the linkInspector. It uses these for selection expansion.
Because tools can now override the static canEditModel method, we can
dynamically evaluate a model, rather than be restricted to only
comparing classes. This will be useful for disabling editors for models
that are for some reason incomplete or otherwise broken and cannot be
safely edited.
Change-Id: I7adf254990112d90f1f808593a9111afc7a116b5
Fixes (follows-up I1b48ef5240, I6daff5c596):
* Invalid html passed to jQuery constructor.
* Use prop() instead of attr() for boolean values.
* Use append() instead of html() when appending nodes instead
of parsing html.
* Rename shadowed variable name clash 'mw' to 'mwData'.
* Fix odd construction where we parse '{}' to create an empty
object.
* Have ve.ce.MWReferenceListNode#update perform changes off-document
in a detached tree.
* Fix deep property access that can fail. mwData is set to
either JSON parse of data-mw attr or empty object.
Accessing mwData.attrs.group needs to be guarded by whether
mw.attrs is indeed set.
* Have `mw` and `about` attribtue in references list roundtrip
(especially mw which can data we aren't editing/re-creating).
* Add missing 'refGroup' property to MWReferenceListNode's
data element (similar to what MWReferenceNode already has).
Change-Id: I67e4f378ccd04e97361d8e58ae57db5353075756
