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