After making the date selector use the brand
new date chooser widget, it is now time to make
it an entry.
This commit, then turns GcalDateSelector into a
GtkEntry subclass, and add all the plumbing that
is necessary to make it work as such.
As a side effect, this commit adds rudimentary
natural language support for parsing dates.
After adding the new GcalDateChooser widget, change the
current date selector to use it as the internal widget
of the popover.
The next logical step is turning GcalDateSelector into
an entry.
Florian Brosch