Standardize wind resource code

[johnjasa]

Standardize wind resource code

With the advent of #461 and #474, we now have three wind resource types available.
The code required to use those datasets is very similar across the different sets.
We should rework the Resource classes so they re-use the same methods where possible; perhaps from an inherited WindResource class, but maybe those methods could live right at the Resource level.

This issue becomes more important if we add more versions of resource data. If we don't add anymore, the code is essentially fine as-is.

Proposed solution

Alternatives considered

Additional context