[windows] Disable external monodoc errors.
Disable "Show Error Reference" from the error pad.
Restore legacy shortcuts for find next/previous.
Restore legacy keybinding for goto line.
Remove linq from utility class that's passed between domains.
Works around problems testing 2.0 assemblies from 4.0-hosted MD on mono.
Merge pull request #27 from Unity-Technologies/unity-staging

Last week's MD changes