Refactor and clean up codebase by removing unused functions and reorganizing imports

- Removed unused model keys and functions from properties.py.
- Deleted projection.py as its functions were no longer needed.
- Cleaned up model_catalog.py by removing unused model directory function.
- Updated imports in various test files to reflect new module structure.
- Removed deprecated test cases related to image editing tools.
- Added new tests for ONNX runtime provider selection logic.

tests/test_addon_registration.py

@@ -65,10 +65,6 @@ class AddonRegistrationTest(BlenderTestCase):
         frame_operator = self.image_frame.FrameImages
         self.assertIn(operator, self.anyimage.CLASSES)
         self.assertIn(frame_operator, self.anyimage.CLASSES)
-        self.assertIn(
-            self.image_frame.ActivateImageEditTool,
-            self.anyimage.CLASSES,
-        )
         self.assertIn(
             self.rectify.RectifyImagePerspective,
             self.anyimage.CLASSES,