* fix: support tab in text Wyswig
* Refactor tab handling
Tab now indent the whole line, instead of inserting at the cursor
position.
Shift+Tab now deindent the whole line.
* Add multi-line tabulation support
* rename
* simplify algo for selected lines start indices & naming tweaks
* add cmd-bracket shortcuts as alias to indent/outdent
* support outdenting partial tabs
Co-authored-by: dwelle <luzar.david@gmail.com>
