Add feature request functionality to webviews

[AIIX]

Description

• Adds feature request functionality for hardware device access to webviews

How to test

• Visit a webcam test site and dialog to allow / deny access should display

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CLA [x] (Whether you have signed a CLA - Contributor Licensing Agreement

[devops-mycroft]

Voight Kampff Integration Test Succeeded (Results)

[codecov-commenter]

Codecov Report

Merging #2956 (45d5d9e) into dev (1d03ead) will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev    #2956      +/-   ##
==========================================
- Coverage   52.66%   52.65%   -0.01%     
==========================================
  Files         123      123              
  Lines       11026    11026              
==========================================
- Hits         5807     5806       -1     
- Misses       5219     5220       +1     

Impacted Files	Coverage Δ
mycroft/tts/tts.py	79.27% <0.00%> (-0.33%)	:arrow_down:

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[krisgesling]

This is working as described but a few small notes for anyone playing from home:

• this requires qml-module-qtwebchannel
• more work is needed to ensure the mic is not "busy" due to Mycroft using it