Plugin Registration Changes

- Re-wrote how the plugin registers itself.
- No longer need @register_wrapper classes get auto detected and added.
- The new Auto loader is much better then the old way, no longer need "if "bpy" not in locals():" this was an old way of doing things and wasn't really efficient.

 using auto_load.py provides several advantages:

- It automatically discovers and loads all modules in the addon.
- It handles dependencies between classes correctly through topological sorting.
- It manages registration order automatically.
- It properly handles unregistration in the correct order.

This approach is much less error prone and I not had any issues so far. However it still needs testing fully.

I have also start to re-organise files into folders as well, this is going to be needed so we don't have a long list of files as Avatar Toolkit is getting larger then i originally planned.

core/exporters/export_resonite.py

@@ -0,0 +1,32 @@
+import bpy
+from typing import List, Optional
+from ...core.common import get_armature
+from bpy.types import Object, ShapeKey, Mesh, Context, Operator
+from functools import lru_cache
+from ...core.translations import t
+
+class AvatarToolKit_OT_ExportResonite(Operator):
+    bl_idname = 'avatar_toolkit.export_resonite'
+    bl_label = t("Importer.export_resonite.label")
+    bl_description = t("Importer.export_resonite.desc")
+    bl_options = {'REGISTER', 'UNDO'}
+    filepath: bpy.props.StringProperty()
+
+
+    @classmethod
+    def poll(cls, context: Context):
+        if get_armature(context) is None:
+            return False
+        return True
+
+    def execute(self, context: Context):
+        #settings stolen from cats.
+        bpy.ops.export_scene.gltf('INVOKE_AREA',
+            export_image_format = 'WEBP',
+            export_image_quality = 75,
+            export_materials = 'EXPORT',
+            export_animations = True,
+            export_animation_mode = 'ACTIONS',
+            export_nla_strips_merged_animation_name = 'Animation',
+            export_nla_strips = True)
+        return {'FINISHED'}