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

refactor: delete unused code

feat: add zooming to cursor

feat: optimize upscale to not use floats

feat: use NN for downscaling and optimize without using floats

fix: image region move within to not set wrong x, y

refactor: handle correctly get and set pixel out of bounds

fix: movement within border underflow of unsigned integer

fix: fragments when resizing

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

feat: add image write to display

feat: add image direct write to display

feat: add image upscale using nearest-neighbor

feat: add image downscale using average

feat: add image region move

feat: add image set and get pixel functions

feat: add basic image functions