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