Allow changing room with Ctrl+tab and Ctrl+shift+tab
Change the way next and previous rooms are handled to enhance readability and expandability of hotkeys that do identical functions. This also saves on lines (if minified especially).

https://github.com/flackr/circ/issues/294
Merge pull request #295 from Arduinology/#294-ctrl-tab-change-room

Allow changing room with Ctrl+tab and Ctrl+shift+tab