refactor/gui_cleanup

[NeonJarbas]

• fix bus in load_pages due to variable name collision
• remove debug flag from tornado listener (makes websocket reload and crash during dev when unrelated files change, very annoying)
• use explicit imports for consistency
• replace print with log

[codecov]

Codecov Report

Merging #182 (0634a27) into dev (6ceb058) will increase coverage by 2.57%.
The diff coverage is 37.58%.

@@            Coverage Diff             @@
##              dev     #182      +/-   ##
==========================================
+ Coverage   50.35%   52.92%   +2.57%     
==========================================
  Files         119      152      +33     
  Lines       10077     9510     -567     
==========================================
- Hits         5074     5033      -41     
+ Misses       5003     4477     -526     

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 138 more

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