Move default biome settings to new class

In Minecraft 1.7, the amount of vanilla biomes will double. The biomes
will also have less things in common. These two things would make the
BiomeConfig class grow huge. This commit prevents that.

All vanilla biomes now have their settings in
VanillaBiomesDefaultSettings. Each biome has their own miniclass, so
default settings (and only *default* settings) can inherit from another
biome.

Also simplified the resource code in the BiomeConfig: it's now an
ArrayList. The settings cache is now a LinkedHashMap so that ordering is
conserved.

Also added JavaDocs to the LocalBiome class.