OpEx Breakdown Function

[dmulas]

Add function to output:

• Operations costs (could include port fees and labor costs, in that case the port feed and labor costs would be zero) [$]
• Port fees [$]
• Labor costs [$]
• Equipment costs [$]
• Material costs [$]
• Total_OpEx [$]
• Total_OpEx [$/kW]

by frequency type, and the average by frequency type

[RHammond2]

It looks like this is nearly there, we just need two things:

1. An updated in the CHANGELOG to call out the modification

2. To ensure the formatting is all consistent by running the pre-commit hooks in your wombat environment

   cd /path/to/WOMBAT/  # if you're not already 
   pre-commit install
   pre-commit run --files wombat/core/post_processor.py
   
   # These steps might need to be run more than once depending on if they pass,
   # require manual correction (unlikely), or have corrections automatically applied
   git add wombat/core/post_processor.py  # the changes need to be registered
   git commit -m "your message"  # you'll notice that pre-commit runs again at this phase
   
   # Once all the commit checks pass or get skipped
   git push

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (20fcb13) 53.76% compared to head (b800a39) 53.73%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #119 +/- ## =========================================== - Coverage 53.76% 53.73% -0.03% =========================================== Files 22 22 Lines 3722 3724 +2 Branches 765 766 +1 =========================================== Hits 2001 2001 - Misses 1599 1601 +2 Partials 122 122 ``` | [Files](https://app.codecov.io/gh/WISDEM/WOMBAT/pull/119?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WISDEM) | Coverage Δ | | |---|---|---| | [wombat/core/post\_processor.py](https://app.codecov.io/gh/WISDEM/WOMBAT/pull/119?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WISDEM#diff-d29tYmF0L2NvcmUvcG9zdF9wcm9jZXNzb3IucHk=) | `5.28% <33.33%> (-0.02%)` | :arrow_down: |

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