fix: add check for errors to main function

fix: remove unused piece of nonblocking io code

refactor: add image viewer fields for better control

feat: add check for null display address for testing

fix: add missing include guards

feat: add image region move

feat: add image set and get pixel functions

fix: ppm image loading

feat: use floats instead of doubles

fix: struct constants

fix: put correct max color constants

refactor: move direction functions to separate module

fix: makefile ovewrite of cflags

feat: add basic image viewer loop

feat: add ppm image loading

feat: add basic image functions

feat: add logger

feat: add input handling functions

feat: add display utils functions

fix: add compile commands to makefile