uqm: Switch to using fetchurl for uqm3donix.

As we now have a tagged first release, it really doesn't make sense to
introduce additional dependencies by using fetchgit.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
uqm: Convert base16 SHA256 hashes to base32.

We want to have shorter SHAs, don't we? :-)

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
uqm: Add an option to use the remix packs.

The remix packs are a collection of newly remixed versions of the
old music from the PC/3DO versions. By using useRemixPacks these are
fetched as well and added to the game.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
uqm: Symlink addons and packages.

Copying these over to the output path of the main derivation will just
unnecessarily blow up the size of it with files we already have in the
store anyway.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
uqm: Add myself to the maintainers list.

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