TiC Tweaks

Nerfed a few things, disabled some other things:

- Disabled Oreberry Bushes and Gravel Ore.  Oreberries are free resources, and gravel ore will be added in CoFH
- Removed ore doubling, as it's basically unnecessary without giant tech mods
- Removed non-metal mattocks, as they are pretty cheap early on, should be something worked up to.
- Disabled floating slime islands (hopefully), as they just seem out of place with what I want.  Blue slimes still spawn, though.
- Disabled being able to craft endstone, as for one it's unnecessary, and two if it was worthwhile, then it's breaking progression.