Master Volume Accessibility Improvements

[astromutt]

Swiping up/down on the touchpad works for adjusting the master volume, but the following additional methods would be helpful:

1. Voice access: ie. "Set the volume to 80%", "Raise the volume", "Make it louder", etc.
2. Voice status: ie. "What is the current volume" with a response similar to "The volume is set to 80%"
3. The ability to set the volume via the current "Settings" web page at openpin.center\blob\settings.