Obligatory "I ruined everything!" thread

[xoft]

Rev 620: Added cWorld:ForEachEntity and cWorld:ForEachEntityInChunk API functions. I have no idea if they work correctly, though - didn't do any testing. And additionally, I have no idea if there's a way for Lua to convert a cEntity into the more specific class, such as cPlayer, cPassiveMob or whatever. We might need to add these when needed.