Corrected some warnings about deprecated `exists?` and unnecessary variable
Chopped `parse_config` to a separate method
Chopped the ACOC module: parsing stuff to a Parser class and version/usage to the binary
Chopped the ACOC module yet again: color stuff to a Painter class
Reformatted some function names
Changed `usage` and `version` output
Reformatted some more - commented a lot
Reformatted a bit more and replaced every instance of British "colour" by North-American "color"