Firewall: add model for categories. work in progress for https://github.com/opnsense/core/issues/4587
Firewall: add model for categories. work in progress for https://github.com/opnsense/core/issues/4587

escape category option values.

opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core