* Update icon font, add group type to field setup
* Add group type, start on group-raw interface
* Add style for group
* Finish nested groups
* Finish field group setup
* Add type check
* Work on group raw group
* Various
* Fix support for nested groups
* Add group-divider interface
* Remove unused file
* Fix linter warning
* Declare return types on functions
And a very few other type related minor fixes
* Minor syntax fixes
* Remove unnecessary escape chars in regexes
* Remove unnecessary awaits
* Replace deprecated req.connection with req.socket
* Replace deprecated upload with uploadOne
* Remove unnecessary eslint-disable-next-line comments
* Comment empty functions / catch or finally clauses
* Fix irregular whitespaces
* Add missing returns (null)
* Remove unreachable code
* A few logical fixes
* Remove / Handle non-null assertions which are certainly unnecessary (e.g. in
tests)
