Implemented inverted positions when selecting regions.
Fixed compass tool and //hpos not seeing the first blocks
Improved compass tool
Fixed bug in RightClick compass tool.
Used wrong table.
Implemented //sphere and //hsphere
Some small optimisations in //shpere and //hsphere
Undo now works with //sphere and //hsphere
Fixed /pumpkins
Added Config.ini to ignore list.
Use the InfoReg library file instead of providing own.
Alpha-sorted the commands.
Implemented //SetBiome.
Fixes #16
Merge pull request #19 from mc-server/SetBiome

Implemented //SetBiome.
Initial cPlayerState and cPlayerSelection code.

/biomeinfo uses the new player state.
Fixed selection Y coords.
Using wand selection reports the set coords.

Also the //size command uses cPlayerState.
Added initial UndoStack implementation.
//set command uses new architecture.
//Replace uses new architecture.