There wasn't enough room to put this in the mod description so I'll post it here:

LICENSE

You're free to use this code in any way as long as proper credit is given for
the work that I, Luke Moloney and the many map authors have done. See the
section titled "Modding Instructions" for instructions on how to reconfigure
the scripts to work with your mod.

MODDING INSTRUCTIONS

The files in the "data\scripts\rules\lib\" folder beginning with "objectlist"
can be reconfigured to make the game rules work with your own mods. Simply add
or remove items to and from the tables as needed, and the gamerules will auto-
matically adjust to the new objects. The tables themselves, however, should not
be removed, or the game will break. Minimal instructions on modifying the
tables can be found within the "objectlist" files themselves.