Refactored vehicle spawning code into seperate file

Refactored vehicle spawning code into seperate file to reduce
duplication, enhance readability, and reduce error.

Order of values to be passed to the new 'spawnVehicle.sqf' are [CP Cost,
Vehicle Type]

Author: ultranoobian

source/dialog/spawnVehicle.sqf

@@ -0,0 +1,13 @@
+_requiredPoints = _this select 0;
+_vehicleType = _this select 1;
+
+if (commandpointsblu1 >= _requiredPoints) then {
+    commandpointsblu1 = commandpointsblu1 - 4;
+    ctrlSetText [1000, format["%1",commandpointsblu1]];
+    _spawnPos = (getpos hq_blu1) findEmptyPosition [40, 120, _vehicleType];
+    _spawnPos = [(_spawnPos select 0), _spawnPos select 1];
+    vehic = _vehicleType createVehicle _spawnPos;
+    hint "Vehicle ready !";
+} else {
+    hint "Not enough command points";
+};