TODO

 - Review all-day checkbox and date/time fields interaction in GcalEditDialog
 - Check width of read-only layer in GcalEditDialog
 - Review the real need of GcalFloatingContainer
 - Review/check the adding of a new source live.
 - Review size/resize of GcalEventView widget
 - Review GcalWeekView implementation to follow Benjamin advice of not composite
   with Gtk+ widgets other than GtkOverlay.
 - Rethink signals from GcalManager
 - Order events for starting hour in GcalMonthView, and the others
 - Add different triggers for hiding the sources view.
 - Connect keyboard-shortcuts like Ctrl+Q
 - Check for the real need of adding timezone, and check everywhere
 - Connect all dconf options to the program
 - Remove body_actor if there's no need of it in the end.
 - Clear/reorder #include in every header file.
 - Review every g_return_if_fail statement since G_OBJECT macros does that
   already

Design stuff

 - What to do when there's no host set in the event.
 - Interactions explained
     - When to show/hide sources view
     - When to show/hide new-event overlay
     - Random stuff I don't remember now

Roadmap

 - Check MonthView is fully functional
 - Add new-event mark to week-view
 - Scroll week-view to the actual-hour

Wish-list

 - Add resize-by-handlers capabilities to GcalEventWidget
 - Add drag-to-move capabilities to events on views