Add a getter command that would return an array of minimum / maximum range of a given artillery piece, as we currently only have `inRangeofArtillery` . These would be the same ranges that are shown in the artillery computer.
Something like:
```
(getArtilleryRange (vehicle player)) params ["_minRange", "_maxRange"];
```
`inRangeOfArtillery` also requires passing a magazine type, so maybe this command would require one as well.