+ BackgroundNoise handler
+ Extracted microphone buffer filling code
+ Doc
+ Automatically extract background noise level
+ Do not pass divisor to Respeaker, but absolute threshold values. Slider always starts in the middle, at analyzed noise level.
+ "Please be quiet" toast
+ Set the parameters to more humane levels
+ Param fiddling
+ TODOs and notes
+ Extract background noise extraction into method
+ Big rewrite of BackgroundNoise handling
+ NoiseLevel handling
+ Default noise level on dialog cancelled.
+ Recorder now uses Microphone.