Merge branch 'dev' into 'master'

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

See merge request bohacfr2/apo-sem!1

refactor: split textviewer to more functions and files

feat: add correct error messages for text viewer and image viewer

feat: split text into multiple lines so it fits

fix: text viewer wrong character

fix: floating point exception

feat: fix text viewer zoom location

feat: add text zoom to text viewer

style: fix text viewer formatting

fix: text viewer blink rgb leds when scroll past line

fix: opening empty file

feat: use ledstrip to show vertical scroll

feat: use ledstrip to show file loading bar

refactor: use name and line pointer instead of local variable

fix: text movement

feat: add rotation encoders

refactor: move text view commands to text viewer

feat: add text viewer main