pkgs/games: Add Starbound 1.0.5 from HumbleBundle

So far we only had the Steam version of Starbound, but since July 22nd
2016 version 1.0 got released and since then had a few bugfixes already.

The Nix implementation here is based on the Steam version but has quite
some improvements: Instead of wrapping the Starbound client and server
with a shell script which sets up the bootconfig, we now use patchelf to
override specific symbols from external libraries and thus can live
without supplying a -bootconfig arg.

By replacing the sbinit.config in the .rdata section of the binaries
with a magic value (13 times the bell character) we can later match the
magic value during open() and provide a default bootconfig using a
temporary file.

Note that it has to be a temporary file instead of fork() and writing to
a pipe() because Starbound is using lseek() during parsing of JSON.

With all this in place we now have everything Starbound related in
$XDG_DATA_HOME/starbound, which is the main reason for doing the
preloading in the first place.

Starbound without patching expects a file called sbinit.config in the
same directory as the executable and even if we'd supply a bootconfig
via the -bootconfig arg, we can only have static paths in there, because
Starbound doesn't do environment variable expansion within paths in the
bootconfig.

Another difference to the Steam packaging is that we now produce
multiple outputs, the default one plus lib for the preload library and
the assets in its own store path.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

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