RNA: move cursor into own struct

Without this it's impractical to subscribe to any change to the cursor.

Fixes T61969 by having gizmos update on any change to the cursor.

release/scripts/startup/bl_operators/object.py

@@ -873,7 +873,7 @@ class DupliOffsetFromCursor(Operator):
         scene = context.scene
         collection = context.collection
 
-        collection.instance_offset = scene.cursor_location
+        collection.instance_offset = scene.cursor.location
 
         return {'FINISHED'}
 
@@ -904,7 +904,7 @@ class LoadImageAsEmpty:
     def execute(self, context):
         scene = context.scene
         space = context.space_data
-        cursor = scene.cursor_location
+        cursor = scene.cursor.location
 
         try:
             image = bpy.data.images.load(self.filepath, check_existing=True)

release/scripts/startup/bl_operators/object_align.py

@@ -130,7 +130,7 @@ def align_objects(context,
     depsgraph = context.depsgraph
     scene = context.scene
 
-    cursor = scene.cursor_location
+    cursor = scene.cursor.location
 
     # We are accessing runtime data such as evaluated bounding box, so we need to
     # be sure it is properly updated and valid (bounding box might be lost on operator

release/scripts/startup/bl_ui/space_view3d.py

@@ -4359,17 +4359,17 @@ class VIEW3D_PT_view3d_cursor(Panel):
     def draw(self, context):
         layout = self.layout
 
-        scene = context.scene
+        cursor = context.scene.cursor
 
-        layout.column().prop(scene, "cursor_location", text="Location")
-        rotation_mode = scene.cursor_rotation_mode
+        layout.column().prop(cursor, "location", text="Location")
+        rotation_mode = cursor.rotation_mode
         if rotation_mode == 'QUATERNION':
-            layout.column().prop(scene, "cursor_rotation_quaternion", text="Rotation")
+            layout.column().prop(cursor, "rotation_quaternion", text="Rotation")
         elif rotation_mode == 'AXIS_ANGLE':
-            layout.column().prop(scene, "cursor_rotation_axis_angle", text="Rotation")
+            layout.column().prop(cursor, "rotation_axis_angle", text="Rotation")
         else:
-            layout.column().prop(scene, "cursor_rotation_euler", text="Rotation")
-        layout.prop(scene, "cursor_rotation_mode", text="")
+            layout.column().prop(cursor, "rotation_euler", text="Rotation")
+        layout.prop(cursor, "rotation_mode", text="")
 
 
 class VIEW3D_PT_collections(Panel):