Rename custom_load_color() to conf_parse_color()
Rename custom_load_color() to conf_parse_color()

Also, temporarily remove all error messages and return an error status
instead.

Signed-off-by: Lukas Fleischer <af90e31281d8305af43dc616c5aaca3c7165f8a7@cryptocrack.de>

lfos/calcurse,lfos/calcurse,lfos/calcurse,dunecn/calcurse,dunecn/calcurse