Feature: Allow more weather columns

[RHammond2]

This PR adds in the ability for the weather data file to have more than just the "windspeed" and "waveheight" columns, enabling easier integration of an expanded weather methodology in the future as well as enabling compatibility with other NREL software packages.

[codecov[bot]]

Codecov Report

Merging #82 (546bec0) into develop (06ad68c) will increase coverage by 0.04%. The diff coverage is 80.00%.

@@             Coverage Diff             @@
##           develop      #82      +/-   ##
===========================================
+ Coverage    55.94%   55.98%   +0.04%     
===========================================
  Files           21       21              
  Lines         3273     3281       +8     
  Branches       618      619       +1     
===========================================
+ Hits          1831     1837       +6     
- Misses        1351     1352       +1     
- Partials        91       92       +1     

Impacted Files	Coverage Δ
wombat/core/environment.py	74.62% <80.00%> (+0.01%)	:arrow_up:

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