Chris-Ivanov

Hi Adam, it looks like the issue is on line 89 and line 129. The inputs needs to be a sequence so the fix for this is putting brackets around...

Below are the functions that need to be migrated from WDRT: ``` def steepness(): """Calculate the breaking wave steepness curve to be plotted in a Hs-Tp plot. Can be used...

The `plot_environmental_contour_multi_year` test in MATLAB should be removed as the python version of `environmental_contours` does not support the input of a list/vector as the `return_period`.

I think we should keep it, because I still need to add the additional copula methods from 130. Otherwise we can close this and make a separate issue for that....

@simmsa I probably wont be able to get to this in the near-term so I wouldnt count on it being in the upcoming release. I'll see if I can make...

@simmsa this PR is ready for review....two things i wanted to point out: * idk if the tests for the plots are ideal, let me know if you think they...

## Changelog * introduction of the mooring module, which includes functionality to read in MoorDyn files, calculate mooring line lay length, and visualize mooring line dynamics in 2D or 3D....