New IFC authoring mode - when enabled, exporting the IFC auto saves the Blender file too. See #1360.

src/ifcblenderexport/blenderbim/bim/module/project/prop.py

@@ -0,0 +1,16 @@
+import bpy
+from bpy.types import PropertyGroup
+from bpy.props import (
+    PointerProperty,
+    StringProperty,
+    EnumProperty,
+    BoolProperty,
+    IntProperty,
+    FloatProperty,
+    FloatVectorProperty,
+    CollectionProperty,
+)
+
+
+class BIMProjectProperties(PropertyGroup):
+    is_authoring: BoolProperty(name="Enable Authoring Mode")