wolf3D 1.0/1.1/1.2 packaging

[Alexandre Detiste]

Here is my proposal to add Wolf3D 1.0/1.1/1.2 to GDP.

When generating the .deb, the package name "wolf3d-full-old-data"
is overiden by the value of package.deb, that holds "wolf3d-full-data";
this way we can have two different, but functionally-equivalent packages.
(think of it as global alternatives instead of per-file alternatives)

https://github.com/a-detiste/game-data-packager/commits/wolf_1_2

If both v1.4 & v1.2 are present, users will only get one package.
As build_packages() work with a set, it's not really a problem,
duplicates will be ignored/overwritten.

Alexandre