Fix/decouple from mycroft

[NeonJarbas]

ensures ovos_workshop can be used without mycroft unless explicitly importing skills module

• decorators were causing cyclic imports
• OvosAbstractApp is meant to run in non-mycroft systems where the import is not available

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (dev@9177788). Click here to learn what that means.
The diff coverage is n/a.

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  Files          ?      25           
  Lines          ?    1448           
  Branches       ?       0           
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  Hits           ?       0           
  Misses         ?    1448           
  Partials       ?       0           

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