Improvements to `-alsaadd` CLI option

This fixes which caused an invalid output device name when -alsaadd was used.

It also orders user-added devices earlier in the list than hardware devices, where previously they would be last. The idea being that if I explicitly add a device, I probably want to use it by default.

This is required for https://github.com/flathub/net.purrdata.PurrData/pull/22

merged