Get rid of C functions in is_valid_color()
Get rid of C functions in is_valid_color()

newsboat/newsboat,der-lyse/newsboat,newsboat/newsboat,der-lyse/newsboat,der-lyse/newsboat,x4121/newsbeuter,der-lyse/newsboat,der-lyse/newsboat,newsboat/newsboat,der-lyse/newsboat,newsboat/newsboat,der-lyse/newsboat,newsboat/newsboat,x4121/newsbeuter,newsboat/newsboat,newsboat/newsboat,newsboat/newsboat,x4121/newsbeuter,der-lyse/newsboat,x4121/newsbeuter