Merge guest binaries.

[WhatAmISupposedToPutHere]

Merge all guest binaries into one binary and process. This removes sommelier support, but people should use x11bridge anyway. Also stop leaking muvm configuration into vm processes.

[asahilina]

FYI, I left a TODO in #130 about moving an env var to the muvm-guest config. If that gets merged first, please make that change too as part of the last commit here when you rebase.

[asahilina]

Needs clippy fixes (probably just an #[allow(clippy::too_many_arguments)] in the problem functions).

[sbrivio-rh]

Ah, thanks, it works headless again. It's also a bit faster now. Tried with #111, without these commits:

$ time for i in `seq 1 10`; do ./target/debug/muvm --sommelier -- true; done

real	0m10.397s
user	0m7.653s
sys	0m3.165s

with:

$ time for i in `seq 1 10`; do ./target/debug/muvm -- true; done

real    0m10.100s
user    0m7.162s
sys     0m2.638s

By the way:

$ time for i in `seq 1 10`; do ./target/debug/muvm --passt-socket=/tmp/passt_3.socket -- true; done

real	0m9.808s
user	0m7.053s
sys	0m2.725s

...not really substantial.

Edit:

$ time for i in `seq 1 10`; do ./target/release/muvm --mem=64 --vram=0 -c 0 -- true; done

real	0m5.049s
user	0m3.135s
sys	0m0.361s

...neat, this.

[sbrivio-rh]

Whee, it comes with --privileged too! \o/

[WhatAmISupposedToPutHere]

It being a tiny bit faster is expected (exec is not free), but is not the reason for those changes.