SQF Script always appends a , to the end of the JSON array output

**Describe the bug**
The SQF to JSON extraction script always appends a comma (,) to the end of the array, making the array invalid and requiring manual intervention.

**Expected behavior**
There is no comma on the last element of the JSON array

**Additional context**
This is the line that formats the joined classes string into a string representation of an array. Perhaps it could be removed here?
```sqf
_JSON = "[" + endl + " " + _joinedClasses + endl + "]" + endl;
```

Start by locating the SQF extraction script and the formatting line that builds _JSON from _joinedClasses. Run the extraction with data that produces multiple array elements, then verify that the generated JSON is valid and has no comma after the final element.

Written by the indexing model from the issue text.