r432 - NPCs

NPC's ended up going along faster than I was expecting. They are pretty basic at the moment but have all the features I said in my previous post for a first release.

• Adds NPC's which just say a single line of text. To place them use the NPC stick and left click on them in debug mode.
• NPC textures are loaded from the "npc" directory within the current map directory.
• Changed water & lava to be destroyed more easily.
• Changed grass rendering to render 3d grass through blocks not being rendered.

With Maps - http://www.mediafire.com/?r7uxudxc081zbie
No Maps - http://www.mediafire.com/?se81lnr1j7d885r