docs: correct formatting

docs: add code documentation

fix: showing unscrollable files correctly

fix: opening empty file

refactor: move gui elements to gui library

feat: use ledstrip to show vertical scroll

feat: use ledstrip to show file loading bar

feat: put errors to enum instead of magic constants in code

feat: use pheripherals in text viewer

refactor: use name and line pointer instead of local variable

fix: text movement

fix: comands uninitialised memory access

feat: add rotation encoders

feat: add full vertial scroll command

refactor: move text view commands to text viewer

feat: add text viewer main

feat: add gui text component

feat: add gui text view component

feat: add gui line component

feat: add base gui functions