AppArmor: don't highlight variable assignments and alias rules within profiles

Summary:
Depends on D20220

There are some minor changes to the AppArmor highlighter.

Changes:

• Don't highlight variable assignments and alias rules inside profiles.
• Add new keywords of "tunables/share" variables.
• Change style of "Other Option" attribute.

Reviewers: Framework: Syntax Highlighting, dhaumann, cullmann

Reviewed By: Framework: Syntax Highlighting, cullmann

Subscribers: kwrite-devel, kde-frameworks-devel

Tags: Kate, Frameworks

Differential Revision: https://phabricator.kde.org/D20221