This splits PulseAudio and JACK emulation into separate outputs. Doing
so provides a number of benefits.
First it fixes pw-pulse and pw-jack. Prior to this they pointed to bogus
locations because the environment variables were not evaluated.
Technically fixing this only requires setting libpulse-path and
libjack-path to any absolute path not necessarily separate outputs but
it comes as a nice result.
Secondly it allows overriding libpulseaudio with pipewire.pulse in many
packages. This is possible because the new outputs have a more standard
layout.
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