Update VisualStudio shortcuts

* Pause: I check documentation and everywhere I see only Control+Alt+Break...
* UppercaseSelection: Was just missing...
* ToggleCodeComment: Since VS doesn't know this command I was thinking of removing this shortcut but decided to keep Mono shortcut instead...
* Add/RemoveComment: VS has 2 shortcuts for this one is Control+E|C and other is Control+K|Control+C. From what I know Control+K|Control+C is from C++ times and Control+E|C was added only in C#. I used always used only Control+E|C hopeful most people as well...
* SwitchSplitWindow, DeleteToLineEnd, DeleteLine: Corrected spaces -> tabs
* ImmediatePad, FormatBuffer, FormatSelection added missing