games-emulation/pcsx2: update live ebuild

ebuild could use more attention before an eventual release (unbundling,
re-checking options/deps, wayland, making tests run), but this is just
quickfixes to at least let it build.

Two new dependencies:
* rapidyaml(new package): replaces yaml-cpp
* cubeb(submodule): replaces portaudio
pcsx2 isn't currently wired to use system's cubeb and it also isn't
packaged, so use submodule for now -- but it'd be good to package it
eventually given other packages like yuzu (which could be nice to have
in ::gentoo eventually) can use it as well. An ebuild would also help
for more proper backend support, but for now hard depend on pulseaudio
given it's the only one it links with. The cubeb introduction in PCSX2
is very recent so it may also be good to wait and see.

Also update licenses for cubeb(ISC) and libchdr(BSD).

/usr/bin/PCSX2 was also renamed to pcsx2, update ebuild to match.
Removed QA_* instead of updating them given the messages do not
seem to trigger anymore.

Runtime wasn't really tested, could be issues -- but it'd be expected
with upstream changing things around.

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

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