feat/error_sound

[JarbasAl]

Add a new error sound effect

Add support for end_listening sound, documented in mycroft.conf but not implemented

as reported in chat the default dialog claiming core is still booting up is very misleading, this has been removed from listener service, it really was a hack so it was now replaced with a error sound

[codecov]

Codecov Report

Merging #211 (f9866e7) into dev (6ceb058) will increase coverage by 3.65%.
The diff coverage is 36.73%.

@@            Coverage Diff             @@
##              dev     #211      +/-   ##
==========================================
+ Coverage   50.35%   54.01%   +3.65%     
==========================================
  Files         119      156      +37     
  Lines       10077     9761     -316     
==========================================
+ Hits         5074     5272     +198     
+ Misses       5003     4489     -514     

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 142 more

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