API Changes to simplify Home Assistant integration

[linknum23]

• Add volume and mute aggregate fields to sources
• Make local RCA inputs look like more streams
• Investigate Airplay/Spotify client issues

[codecov-commenter]

Codecov Report

Merging #242 (74f3af8) into develop (5052899) will increase coverage by 0.76%.
The diff coverage is 74.00%.

@@             Coverage Diff             @@
##           develop     #242      +/-   ##
===========================================
+ Coverage    56.22%   56.99%   +0.76%     
===========================================
  Files           11       12       +1     
  Lines         2659     2681      +22     
===========================================
+ Hits          1495     1528      +33     
+ Misses        1164     1153      -11     

Flag	Coverage Δ
unittests	56.99% <74.00%> (+0.76%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
amplipi/extras.py	0.00% <0.00%> (ø)
amplipi/formatter.py	21.73% <21.73%> (ø)
amplipi/rt.py	27.15% <66.66%> (+1.15%)	⬆️
amplipi/app.py	87.04% <79.16%> (+0.16%)	⬆️
amplipi/ctrl.py	82.33% <96.96%> (+0.43%)	⬆️
amplipi/hw.py	35.21% <100.00%> (+2.16%)	⬆️
amplipi/models.py	94.60% <100.00%> (+0.27%)	⬆️

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