AppArmor: update syntax

Summary:
Changes:

• Add new domain keywords for network rules.
• Remove unsupported 'to' operator for link rules.
• Only highlight the 'in' operator in mount rules.
• Only highlight valid numbers in rlimit rules.

More info: https://gitlab.com/apparmor/apparmor/wikis/Release_Notes_2.13.3

Reviewers: Framework: Syntax Highlighting, dhaumann, cullmann

Reviewed By: Framework: Syntax Highlighting, dhaumann

Subscribers: kwrite-devel, kde-frameworks-devel

Tags: Kate, Frameworks

Differential Revision: https://phabricator.kde.org/D21960