yzziizzy/minetest_bitumen: Adds bitumen to minetest, including tar sands, oil shale, refineries, and some basic generators @ 32d204111c04512d6369246799dbb2ba53856f9d

Izzy fdcc77edf2 cement mixer, concrete tweaks		vor 5 Jahren
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cement_mixer.obj	095e48f4e2 better organization	vor 6 Jahren
oil_derrick.obj	095e48f4e2 better organization	vor 6 Jahren
sphere.obj	5bbfa4eb07 spherical tank	vor 6 Jahren
storage_tank.obj	fdcc77edf2 cement mixer, concrete tweaks	vor 5 Jahren