[mt146] Implement Terrains Swapping

Signed-off-by: Yaki Khadafi <elsoldollo@gmail.com>
[mt147] Fix SMSG_SET_PLAYER_DECLINED_NAMES_RESULT structure

Signed-off-by: Yaki Khadafi <elsoldollo@gmail.com>
[mt148] Fix client freeze fix on player teleport.

Signed-off-by: Yaki Khadafi <elsoldollo@gmail.com>