Bug 25279: Use the API to list cities

Bug 25279: Use the API to list cities

This patch makes the general cities datatable use the API for rendering.
To test:
1. Test the datatable behaviour
2. Apply this patch
3. Repeat your tests
=> SUCCESS: Things work! Filtering and sorting specially

Bonus: Use the browser inspector to notice each interaction with the
datatable triggers an API call with the right query parameters

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>