HigherPower - Fixed /genhere

I decided to finally fix the inability of HigherPower's /genhere to generate villages and scattered features.  It was pretty easy to do once I noticed the reason for its failure: MapGenVillage's getStructureStart calls a constructor with worldObj, which is not specified in its own constructor.  All I had to do was add a little more reflection to set that to the command sender's world.

This is the result of spamming "/genhere village" with some temples mixed in: