Implement namespace global back button management for mobile

[AIIX]

• Implements global back button management in gui namespace for mobile

[codecov]

Codecov Report

Merging #194 (66d9ea8) into dev (6ceb058) will increase coverage by 3.13%.
The diff coverage is 36.63%.

@@            Coverage Diff             @@
##              dev     #194      +/-   ##
==========================================
+ Coverage   50.35%   53.48%   +3.13%     
==========================================
  Files         119      153      +34     
  Lines       10077     9793     -284     
==========================================
+ Hits         5074     5238     +164     
+ Misses       5003     4555     -448     

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 139 more

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