Update plugin metadata to the new format

__init__.py

@@ -4,7 +4,12 @@ from . import CuraEngineBackend
 from UM.Preferences import Preferences
 
 def getMetaData():
-    return { "name": "CuraEngine Backend", "type": "Backend" }
+    return {
+        'type': 'backend',
+        'plugin': {
+            'name': "CuraEngine Backend"
+        }
+    }
 
 def register(app):
     Preferences.addPreference("BackendLocation","../PinkUnicornEngine/CuraEngine")