New keyboard shortcuts

Relocated keyboard shortcut code into Metamaps.Listeners.... Then added CTRL+ R , +H, and +D shortcuts for remove, hide and delete.

Once this is finalized, the console.log's should be removed.
Yes, you can even move the default case up instead of having it the bottom if that helps somehow:
http://www.w3schools.com/js/js_switch.asp

See common code and fallthrough at the bottom @Connoropolous