Support for specific wave headings

[mattEhall]

There are use cases where it could be nice to do a HAMS analysis for specific wave headings that are not evenly distributed. For example, calculating excitation coefficients at -10, 0, 10, 80, 90, 100 degree headings, while skipping other headings for efficiency.

The HAMS input file format (e.g. https://github.com/YingyiLiu/HAMS/blob/master/CertTest/Moonpool/Input/ControlFile.in) seems to support this, similar to WAMIT.

Could we adjust the pyHAMS write_control_file function to also allow this approach of specifying specific headings?

I'd be happy to look into what would need changing (in https://github.com/WISDEM/pyHAMS/blob/main/pyhams/pyhams.py), but wanted to ask what others think first.