Add a job to handle processing of GCode from the backend

ProcessGCodeJob.py

@@ -0,0 +1,17 @@
+from UM.Job import Job
+from UM.Application import Application
+
+import os
+
+class ProcessGCodeJob(Job):
+    def __init__(self, message):
+        super().__init__()
+
+        self._message = message
+
+    def run(self):
+        with open(self._message.filename) as f:
+            data = f.read(None)
+            Application.getInstance().getController().getScene().gcode = data
+
+        os.remove(self._message.filename)