Merge branch 'dev' into 'master'

Implement first versions of file browser, text viewer and image viewer

See merge request bohacfr2/apo-sem!1

docs: correct formatting

docs: add code documentation

feat: add outline for cursor

feat: add zooming to cursor

fix: cursor size to look natural

refactor: unify cursor functions

refactor: move direction functions to separate module

feat: add cursor functions