Merge branch 'dev' into 'master'

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

See merge request bohacfr2/apo-sem!1

feat: add text viewer better keyboard controls

refactor: split textviewer to more functions and files

fix: log not enough arguments as error

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

feat: add support for font family

fix: floating point exception

feat: set default font size for text viewer

feat: add support for larger fonts

feat: fix text viewer zoom location

feat: add text zoom to text viewer

style: fix text viewer formatting

feat: add mzapo sdl

fix: text viewer blink rgb leds when scroll past line

refactor: cleanup build flags

docs: correct formatting

docs: add code documentation

fix: opening empty file