TODO

 - Reorder GcalMainToolbar
 - Rethink signals from GcalManager
 - Order events for starting hour in GcalMonthView, and the others
 - Review static modifiers
 - Connect keyboard-shortcuts like Ctrl+Q
 - Check for the real need of adding timezone, and check everywhere
 - Create GcalView interface or superclass of all views.
 - Connect all dconf options to the program
 - Remove body_actor if there's no need of it in the end.