Updated Java, C++, Python, Rust worker programs to catch the new exception; removed error message string comparisons.

python/qrcodegen-worker.py

@@ -68,9 +68,7 @@ def main():
 				for x in range(qr.get_size()):
 					print(1 if qr.get_module(x, y) else 0)
 			
-		except ValueError as e:
-			if e.args[0] != "Data too long":
-				raise
+		except qrcodegen.DataTooLongError:
 			print(-1)
 		sys.stdout.flush()