By default media players get a chrome cast icon, which feels
quite wrong for my old style amplifier that doesn't have any
connection to the rest of the word, except for a RS232 port.
Some amplifiers/receivers do not report any volume (due to them not
knowing), for example NAD C 356BEE is documented to return an empty
string for volume.
At least don't crash when we get None back.
* Consolidate
* Fix tests
* Update imports
* Fix import
* Use importlib because integration and package share name
* Fix more tests
* Update .coveragerc and CODEOWNERS
Frederik Gladhorn
Erik Montnemery
springstan
Paulus Schoutsen
cgtobi
Rohan Kapoor
Paulus Schoutsen