MsfStream getStream(int streamNumber) {
		return mapStreamNumberToStream.get(streamNumber);
	}
Returns the {@link MsfStream} from the stream table indexed by the streamNumber
@param streamNumber the number ID of the stream to retrieve
@return {@link MsfStream} or {@code null} if no stream for the streamNumber
Ghidra/Features/PDB/src/main/java/ghidra/app/util/bin/format/pdb2/pdbreader/msf/MsfStreamTable.java