Remove the non-standard About command
Remove commented/unused code
Move context commands to Git submenu, group file commands and "general" commands separately
Simplify labels for obvious Git commands
Implement GetSccGlyphFromStatus
Implement IVsSccManager3 to allow background solution loading in VS 2012
Set proper __SccStatus flags
Add GlobalCommandHook
Hook the Solution Refresh command to also update the SCC status