convert the module to the new parser

this PR adds the opm-parser support code which is required to convert the remaining modules. after this, the whole thing will become a downhill struggle as the old parser doesn't have to be supported by the "leaf" modules and can thus be removed directly.

All ctests for opm-porsol and opm-upscaling still pass, opm-polymer does not build on my machine because of OPM/opm-polymer#57 being not yet merged...