Support for inverters with JSON output

[klaasnicolaas]

• Add pytest with coverage to the project
• Add initial support for inverters with a JSON file output to read
• Add tests to the project
• Improve code

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@8a7cb03). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #15   +/-   ##
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  Coverage          ?   81.39%           
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  Files             ?        4           
  Lines             ?       86           
  Branches          ?       10           
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  Hits              ?       70           
  Misses            ?       13           
  Partials          ?        3           

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