Moved 3mf writer here from Uranium

CURA-1263

plugins/3MFWriter/__init__.py

@@ -0,0 +1,38 @@
+# Copyright (c) 2015 Ultimaker B.V.
+# Uranium is released under the terms of the AGPLv3 or higher.
+
+from UM.i18n import i18nCatalog
+from . import ThreeMFWorkspaceWriter
+from . import ThreeMFWriter
+
+i18n_catalog = i18nCatalog("uranium")
+
+def getMetaData():
+    return {
+        "plugin": {
+            "name": i18n_catalog.i18nc("@label", "3MF Writer"),
+            "author": "Ultimaker",
+            "version": "1.0",
+            "description": i18n_catalog.i18nc("@info:whatsthis", "Provides support for writing 3MF files."),
+            "api": 3
+        },
+        "mesh_writer": {
+            "output": [{
+                "extension": "3mf",
+                "description": i18n_catalog.i18nc("@item:inlistbox", "3MF file"),
+                "mime_type": "application/vnd.ms-package.3dmanufacturing-3dmodel+xml",
+                "mode": ThreeMFWriter.ThreeMFWriter.OutputMode.BinaryMode
+            }]
+        },
+        "workspace_writer": {
+            "output": [{
+                "extension": "3mf",
+                "description": i18n_catalog.i18nc("@item:inlistbox", "3MF file"),
+                "mime_type": "application/vnd.ms-package.3dmanufacturing-3dmodel+xml",
+                "mode": ThreeMFWorkspaceWriter.ThreeMFWorkspaceWriter.OutputMode.BinaryMode
+            }]
+        }
+    }
+
+def register(app):
+    return {"mesh_writer": ThreeMFWriter.ThreeMFWriter(), "workspace_writer": ThreeMFWorkspaceWriter.ThreeMFWorkspaceWriter()}