[Ide] Optimized search categories.
[ui-refresh] Fixed little performace problem in search category.
Bump xwt for some .NET 4.5 build fixes.
Remove the search feature in the class pad

It has been superseded by the global search entry
[build] Bump md-addins for picking up unit testing
Fix bug 7659 - Terrible quick search matching
[build] Bump md-addins for tests
[gtkrc] Re-enable the native dialog buttons on OSX

The crash I'd observed no longer appears to happen
[UIRefresh] Implement threaded rendering for DockNotebook
[gtkrc] Try to align text a bit better next to quartz checkboxes
[gtkrc] Fix dialog button selector to be more specific
[UIRefresh] Switch ThreadedRenderer to using ThreadPool
Updated md-addins to bring FRC fix
Merge branch 'ui-refresh-quartz-engine' into ui-refresh

Conflicts:
	main/src/core/MonoDevelop.Ide/gtkrc.win32
[UIRefresh] Update welcome page to match designs
[Ide] Filtered members in project search category before they're
resolved.
Updated nrefactory.
Updated nrefactory.
[Ide] Improved member filtering.
[Ide] Optimizes search algorithm further.