refactor/native_ocp

[NeonJarbas]

always use OCP as default audio backend unless it is not installed

[codecov]

Codecov Report

Merging #154 (a285819) into dev (6ceb058) will increase coverage by 2.69%.
The diff coverage is 42.61%.

@@            Coverage Diff             @@
##              dev     #154      +/-   ##
==========================================
+ Coverage   50.35%   53.04%   +2.69%     
==========================================
  Files         119      152      +33     
  Lines       10077     9788     -289     
==========================================
+ Hits         5074     5192     +118     
+ Misses       5003     4596     -407     

Impacted Files	Coverage Δ
mycroft/audio/__main__.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/__main__.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/mark1/arduino.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/mark1/eyes.py	0.00% <0.00%> (ø)
mycroft/client/enclosure/mark1/mouth.py	0.00% <0.00%> (ø)
mycroft/client/speech/__main__.py	0.00% <0.00%> (ø)
mycroft/client/speech/hotword_factory.py	0.00% <0.00%> (-88.89%)	⬇️
mycroft/client/speech/service.py	0.00% <0.00%> (ø)
mycroft/client/speech/silence.py	0.00% <0.00%> (-42.86%)	⬇️
mycroft/client/text/__init__.py	0.00% <0.00%> (ø)
... and 120 more

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[NeonDaniel]

Looks good; OCP can be uninstalled for edge cases needing a different default