[saco] Implement and match CPlayerPed::GetCurrentWeapon()

saco/game/scripting.h

@@ -42,6 +42,7 @@ const SCRIPT_COMMAND add_to_player_money				= { 0x0109, "ii" };		// PLAYER_CHAR,
 const SCRIPT_COMMAND destroy_racing_checkpoint			= { 0x06d6,	"i" };
 
 const SCRIPT_COMMAND set_actor_armed_weapon				= { 0x01b9, "ii" };
+const SCRIPT_COMMAND get_actor_armed_weapon				= { 0x0470, "iv" };
 
 const SCRIPT_COMMAND set_actor_can_be_decapitated		= { 0x0446, "ii" };