Add basic UFP writer plug-in

This already implements most of it. Just the thumbnail must still be gotten and put inside the container.

Contributes to issue CURA-4872.

plugins/UFPWriter/__init__.py

@@ -0,0 +1,25 @@
+#Copyright (c) 2018 Ultimaker B.V.
+#Cura is released under the terms of the LGPLv3 or higher.
+
+from . import UFPWriter
+from UM.i18n import i18nCatalog #To translate the file format description.
+from UM.Mesh.MeshWriter import MeshWriter #For the binary mode flag.
+
+i18n_catalog = i18nCatalog("cura")
+
+def getMetaData():
+    return {
+        "mesh_writer": {
+            "output": [
+                {
+                    "mime_type": "application/x-ufp",
+                    "mode": MeshWriter.OutputMode.BinaryMode,
+                    "extension": "ufp",
+                    "description": i18n_catalog.i18nc("@item:inlistbox", "Ultimaker Format Package")
+                }
+            ]
+        }
+    }
+
+def register(app):
+    return { "mesh_writer": UFPWriter.UFPWriter() }