Do not send purchased vehicle marker arrow over network

Only the player buying the vehicle needs to see the arrow.

Also fixed CfgMagazines error from:
https://github.com/EpochModTeam/DayZ-Epoch/commit/2c4c75c67c7b0230d5850b2a304a5b83020d3a3b#diff-fcf3df9a25b3d05402ab4e4809673194R6
@icomrade

SQF/dayz_code/compile/fn_waitForObject.sqf

@@ -0,0 +1,12 @@
+private ["_object","_sign"];
+
+_object = _this select 0;
+_sign = _this select 1;
+
+waitUntil {
+	uiSleep 1;
+	!isNull (nearestObject [player,_object])
+};
+
+deleteVehicle _sign;
+player reveal (nearestObject [player,_object]);