Updated references to xwt, md-addins
Merge pull request #416 from knocte/master

Fix typo in user-visible string
[SourceEditor] Added text editor option to change the generation of
multi level undo steps for editor corrections.
[TextEditor] Be more careful with stacking keyboard undo steps.
[SourceEditor] Changed general formatting undo step option default.
Fixed 'Bug 15335 - In a multiline comment, pressing Enter jumps way ahead'
[SourceEditor] Editor now detects mixed line endings as well.
Fixed 'Bug 13989 - Importable symbols selected before imported
symbols'.
Fixed 'Bug 15303 - Redundant cast false positive'.
Fixed mixed line ending detection.
Bump nrefactory.
Fixed 'Bug 14898 - Cant edit no any highlight scheme'.
[build] Bump monomac for ios api doc fixes
[TextEditor] Set the background color of the scrolled window as a hint to
gtk+ to determine the brightness so it can use either dark or light overlay
scrollbars on Mac.  See bockbuild a5941db3f400834df90bf6c2f312da0a100aeecf

Fixes https://bugzilla.xamarin.com/show_bug.cgi?id=15257
[Core] Report Raygun errors from a background thread instead of the UI thread.
Fixed 'Bug 15388 - Create new console project, no completion +
deadlock when closing project'
Bump nrefactory.
Bump nrefactory.
Bump nrefactory.
Fixed 'Bug 15233 - Syntax highlighting incorrect in F#'.