Add SnapForm panels, preferences, properties, and runtime management

- Implemented RuntimeModelsPanel and DebugPanel for UI integration in Blender.
- Created SnapFormPreferences to manage user settings for storage and runtime configuration.
- Defined SnapFormSettings to hold various properties related to input, model selection, and export options.
- Developed runtime management functions for installation, model downloading, and reconstruction commands.
- Added status bar functionality to display job progress and status in the Blender UI.
- Implemented worker script for handling model downloads and depth reconstruction tasks.
- Introduced unit tests for download progress reporting and image depth extraction functionalities.

src/snapform/__init__.py

@@ -0,0 +1,50 @@
+import bpy
+
+from .image_depth import (
+    BuildDepthPlane,
+    ConvertImageToDepthPlane,
+    draw_image_context_menu,
+)
+from .operators import (
+    CancelJob,
+    RunJob,
+    cancel_active_job,
+    close_active_job,
+)
+from .panel import DebugPanel, RuntimeModelsPanel
+from .preferences import SnapFormPreferences
+from .properties import SnapFormSettings
+from .status_bar import draw_status_bar
+
+
+CLASSES = (
+    SnapFormPreferences,
+    SnapFormSettings,
+    RunJob,
+    CancelJob,
+    BuildDepthPlane,
+    ConvertImageToDepthPlane,
+    RuntimeModelsPanel,
+    DebugPanel,
+)
+
+
+def register():
+    for class_type in CLASSES:
+        bpy.utils.register_class(class_type)
+    bpy.types.Scene.snapform_settings = bpy.props.PointerProperty(
+        type=SnapFormSettings,
+    )
+    bpy.types.STATUSBAR_HT_header.append(draw_status_bar)
+    bpy.types.VIEW3D_MT_object_context_menu.append(draw_image_context_menu)
+
+
+def unregister():
+    cancel_active_job()
+    close_active_job()
+    bpy.types.VIEW3D_MT_object_context_menu.remove(draw_image_context_menu)
+    bpy.types.STATUSBAR_HT_header.remove(draw_status_bar)
+    if hasattr(bpy.types.Scene, "snapform_settings"):
+        del bpy.types.Scene.snapform_settings
+    for class_type in reversed(CLASSES):
+        bpy.utils.unregister_class(class_type)