Refactored BiomeManager stronghold add/remove methods to support new

MapGenStronghold dynamic biome changes.
Changed InitNoiseGensEvent to pass a NoiseGenerator array instead of
NoiseGeneratorOctaves due to new NoiseGeneratorPerlin in
ChunkProviderGenerate.
Fixed worldgen crash caused by wrong metadata in Chunk patch.
Merge pull request #890 from bloodmc/master

Refactored BiomeManager stronghold add/remove methods to support new MapGenStronghold dynamic biome changes.