feat: add loading progress bar

refactor: split pheripherals to separate library

feat: add mode change to scroll through picture

feat: add zooming to cursor

feat: add zoom reset

fix: movement within border underflow of unsigned integer

fix: cursor uninitialised fields

feat: add possibility to write only to part of the display

fix: image viewer function to display image

feat: check for errors when loading image

refactor: make move cursor handlers to one function

feat: add basic image viewer loop