Highlighting indexer: check kateversion

Summary:
Checks that files using <include> are in version 5.53 and that contexts do not reference a higher version.

The output looks like this:

$ ninja data/index.katesyntax
".../data/syntax/markdown.xml" depends on a language in version 5.53. Please, increase kateversion.
".../data/syntax/djangotemplate.xml" depends on a language in version 5.0. Please, increase kateversion.
...

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/D23416