Bug 31333: Add ability to make purchase suggestions by borrower type

Bug 31333: Add ability to make purchase suggestions by borrower type

Introduce a suggestionPatronCategoryExceptions system preference.

If the suggestion syspref is enabled then libraries can stop specific
borrower types from making suggestions by ticking the type in the
suggestionPatronCategoryExceptions syspref.

Test plan:
1. Apply patches, update database, re-start services

2. Set 'suggestion' syspref = 'Allow'

3. Confirm you can view the purchase suggestion links on OPAC biblio detail
page & 'your summary' page. As well as successfully submit a suggestion.

4. Select the patron category you're logged in as in
suggestionPatronCategoryExceptions syspref

5. Confirm the purchase suggestion links are hidden in the OPAC biblio
detail page & 'your summary' page

6. In your browser enter the link: <OPAC base URL>/cgi-bin/koha/opac-suggestions.pl
e.g. http://localhost:8080/cgi-bin/koha/opac-suggestions.pl

7. Confirm a 404 page loads

8. Confirm you can view/moderate suggestions in the staff
client - even though your patron is selected in the
suggestionPatronCategoryExceptions syspref

9. Untick your patron category in the suggestionPatronCategoryExceptions syspref

10. Confirm you can view the purchase suggestion links on the OPAC, as
well as successfully submit a suggestion.

11. Set 'suggestion' syspref = "Don't allow"

12. Confirm the purchase suggestion links are hidden in the OPAC

13. Select all patron categories in suggestPatronCategoryExceptions
syspref. View the OPAC without logging in and confirm you can perform
searches and view OPAC biblio detail pages.

Sponsored-by: Catalyst IT, New Zealand
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>