Add plugins for prepare and monitor stages

cura/Stages/CuraStage.py

@@ -1,3 +1,6 @@
+# Copyright (c) 2017 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
 from UM.Stage import Stage
 
 class CuraStage(Stage):

plugins/PrepareStage/PrepareStage.py

@@ -0,0 +1,11 @@
+# Copyright (c) 2017 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from cura.Stages.CuraStage import CuraStage
+
+
+##  Stage for preparing model (slicing).
+class PrepareStage(CuraStage):
+
+    def __init__(self):
+        super().__init__()

plugins/PrepareStage/__init__.py

@@ -0,0 +1,18 @@
+# Copyright (c) 2017 Ultimaker B.V.
+# Cura is released under the terms of the LGPLv3 or higher.
+
+from . import PrepareStage
+
+from UM.i18n import i18nCatalog
+i18n_catalog = i18nCatalog("cura")
+
+def getMetaData():
+    return {
+        "stage": {
+            "name": i18n_catalog.i18nc("@item:inmenu", "Prepare"),
+            "weight": 0
+        }
+    }
+
+def register(app):
+    return { "stage": PrepareStage.PrepareStage() }