Mooring module

[hivanov-nrel]

Creating a standalone matlab mooring module with similar functionality as the MHKiT python version.

functions:

• read_moordyn
• read_moordyn_input
• line_lay_length
• plot_animate

tests:

• created
• passing

example:

• moordyn example

[hivanov-nrel]

@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 progress in the next couple of weeks though. Feel free to take a stab at the remaining tasks if there is a big push to include this in the release.