Add thread state to IThreadMirror.
Add return type information to IMethodMirror.
Add support for stepping type.
Add bound breakpoint param eter to binding and unbinding events.
Merge branch 'master' of https://github.com/Unity-Technologies/debugger into vsdebugger
Fix dictionary modification when enumerating during breakpoint bounding.
Make window resizable. Fix nre.
Merge fixes from vsdebugger branch