Not every option is exposed by redshift/gammastep parameters, for
example gamma options are only exposed in configuration file. So this
PR refactors this module to generate a configuration file and pass it
to the redshift/gammastep using -c parameter.
This is a breaking change since there is no support for some of the
older options like `extraOptions`, but unless you use `extraOptions`
it should work without changes.
d8dd2a09b0