Adjust wave forcing logic

[eclare108213]

wave_spec_type
= ‘none’ - No wave data provided, no wave-ice interactions
= ‘profile’ - constant spectra, for testing only
= ‘coupled’ - from file or coupling with wave model

wave_height_type
= ‘none’ ?
= ‘internal’ - calculated from wave spectra within sea ice model
= ‘coupled’ - from file or coupling with wave model

wave_frac_type
= ‘none’ ?
= ‘HT15-single’ - as Horvat & Tziperman (2015) - one iteration with fixed sea surface height phase
= ‘HT15-convergence’ - as Horvat & Tziperman (2015) - run to convergence with random sea surface height phases

Suggested by @lettie-roach in #545 (comment)