Implement the getFilterOptions and searchFor function.
Fix a wrong select query. Cleanup code.
Merge branch 'origin/dev'

Conflicts:
	src/system/modules/metamodelsattribute_tabletext/MetaModels/Attribute/TableText/TableText.php
Add a missing php documentation after merging.
Bugfix: Set the Database in the right namespace.
Merge branch 'origin/contao3'