Outline improvements
Functionality of the outline view could be improved.
- when navigating in the ttcn3 source code, the corresponding outline element should be selected
- autoselected outline item should be expanded if it is currently collapsed
- it is almost impossible to find an inactive selected item when using dark theme
- indicate deprecated elements with strikethrough (depending on semantic highlighting setting)
- add type info for outline elements
- try implementing hover support providing doc comment and code peek
- add outline preferences page
- notify outline to refresh after incremental updates
- add support for the non-standard @category tag
- implement filtering based on @category