Remove version specificity

Should now work on VS2012.
Also remove unused empty RESX.

This breaks designer theming;
SettingsManager looks for the
wrong version of IVsSettings.

Also implented IOleServiceProvider, to
remove dependency on UnitTestFramework
Skip known bad properties

Eliminates Output Window noise
Don't notify when applying initial user settings

Only show notifications when something non-obvious happens.
Notifications: Don't make TopMost

Since the toast window is a child window of
Visual Studio, TopMost is unnecessary and
annoying.

Switching out of VS now covers notifications.
Command: Add accelerator
Notifications:: Fix potential null ref