Updated references to xwt, md-addins
Updated reference to md-addins
[Debugger] Set the scrollbar policies to automatic

Should fix bug #21425
[Xml] Fixed crash caused by shared project support

BXC21487 - Crash closing a text editor which is working on an xml file
[T4] BXC21500 - "Hack" in TemplatingEngine crashes T4
Fixed 'Bug 21447 - Error thrown when trying to auto-generate members
when implementing an interface'.
Merge branch 'master' into nuget-support-v2