Bug 36351: Add CSRF tokens to advanced cataloguing editor POST requests

Bug 36351: Add CSRF tokens to advanced cataloguing editor POST requests

The editor uses ajax post requests to SVC api.
Becuase these apis are XML based requests, they must be handled in the simplest way, by
embedding the token as a header

To test:
1 - Browse to Cataloguing->Advanced editor
2 - Fill out needed values and save
3 - 403 error
4 - Apply patch
5 - Reload and try agian, success!
6 - Edit and save again, success!

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>