SQL: various improvements and fix if/case/loop/end detection with SQL (Oracle)
Previously, the variables prefixed by if / case / loop / end are a mix of keywords and normal text.
- Categorization of "Keywords" to "Operator Keyword" and "ControlFlow".
- Removes duplicate keywords in "functions" and "keywords" list.
- Some elements of the keywords list are moved to the functions list.
- Adds SQL functions.
- Removes symbols from Keyword list.
Reviewers: Framework: Syntax Highlighting, dhaumann, cullmann
Reviewed By: Framework: Syntax Highlighting, dhaumann, cullmann
Subscribers: kwrite-devel, kde-frameworks-devel, cullmann, rkflx
Differential Revision: https://phabricator.kde.org/D11470