@Override
		public int compare(DataTypeManager dtm1, DataTypeManager dtm2) {
			if (dtm1 == programDataTypeMgr) {
				return -1;
			}
			if (dtm2 == programDataTypeMgr) {
				return 1;
			}
			if (dtm1 instanceof BuiltInDataTypeManager) {
				return -1;
			}
			if (dtm2 instanceof BuiltInDataTypeManager) {
				return 1;
			}
			return 0;
		}
Ensures that the data type managers are used in a particular order.
The order is as follows:
   1) the program's data type manager
   2) the built-in data type manager
   3) the open data type archives
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb/PdbDataTypeParser.java