Rough initial SimpleOres2 module (IC2-derived)

From the file head:

Based on the configuration files for IC2 Copper, Tin, and Urainum (for
Adamantium), with tweaks to more closely fit the heights and frequency
of default SO2.

This is an incomplete adaptation. Only "Veins" distributions have been
adjusted from the values borrowed from the IC2 file, i.e., choosing
"Standard" will work but will not behave as expected. Similarly,
"Clouds" will not give expected results.

TODO:

- Add Onyx support
- Tune SO2TinVeins down a bit (playtesting shows veins are slightly too
frequent
and much too long)
- Reduce max height of Tin and Copper veins while also allowing to
generate inside mountains
(maybe by implementing child distributions for just the tall parts of
tall biomes?)
- Do Standard adaptations
- Do Cloud adapatations
- Develop biome-specific child distributions for Mythril and Adamantium