New implementation of room filters

[mazfil]

Continuation of old issue #60

Currently the filtering of rooms in the timetable management page is unclear and current implementation doesnt allow for clear visual feedback of selected rooms.

[mazfil]

Could potentially implements a row of divs for each room e.g.:

<div>
  <p>Room Name</p>
  <input type="checkbox" defaultChecked="true">
</div>

and implement a function which changes the activeView variable when each checkbox is modified.

[mazfil]

Completed in 49a7faceed910049c9910012be9db769c6f58340