[0] u16 TOSERVER_INIT
[2] u8 deployed version
[3] v3s16 player's position + v3f(0,BS/2,0) floatToInt'd
- ([4] u64 map seed (new as of 2011-02-27))
+ [12] u64 map seed (new as of 2011-02-27)
NOTE: The position in here is deprecated; position is
explicitly sent afterwards