Add cf input to tidal turbine design page

[mjprilliman]

Description

-Expose target capacity factor input for tidal turbine design feature
-Was previously an assumed 30%
-See #1807 for context of this and what was added in patch 2
-See NREL/ssc#1218 for ssc

Checklist:

If you have added a new compute module in a SSC pull request related to this one, be sure to check the Process Requirements.

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[cpaulgilman]

@mjprilliman Should this new input variable in the UI be named tidal_turbine_target_cf with the label "Target capacity factor" to avoid confusion with the capacity factor output?

[mjprilliman]

@mjprilliman Should this new input variable in the UI be named tidal_turbine_target_cf with the label "Target capacity factor" to avoid confusion with the capacity factor output?

Yes that's a great point. I will clean this up.

[cpaulgilman]

Variable name and label changes look good.

[cpaulgilman]

@mjprilliman Could you add a short description here of how the target capacity factor input works that I can use as a basis for Help documentation?