group-desktop: Migrate to media-video/pipewire

We have been using PipeWire [1] on our main desktop system for a while
now and it runs without any problems. Since we don't see the need to
stay with PulseAudio, completely migrate the group-desktop profile to
PipeWire instead.

This needs a couple of changes. PulseAudio is still pulled in by a large
amount of packages, so we can't simply remove it. If we want to use
PipeWire's ALSA plugin whilst having PulseAudio installed, we need to
make sure we disable the 'alsa-plugin' USE flag for it so they don't
conflict.

Additionally, media-video/wireplumber requires a version of Lua that is
not LuaJIT. Commit 23d2912 (group-base: Use LuaJIT as the default Lua
provider, 2021-02-05) masks any normal Lua version, so we have to be
specific here and enable a single LUA_SINGLE_TARGET version.

For now also unmask all relevant software packages as development seems
pretty speedy. We want to get new features (and fixes) as soon as
possible.

[1] https://pipewire.org/

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