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.

functions/digitigrade_legs.py

@@ -1,11 +1,10 @@
 import bpy
 from ..core import common
-from ..core import register_wrap
-from .translations import t
+from ..core.translations import t
 import re
 
 
-@register_wrap
+
 class AvatarToolKit_OT_CreateDigitigradeLegs(bpy.types.Operator):
     bl_idname = "avatar_toolkit.create_digitigrade_legs"
     bl_label = t('Tools.create_digitigrade_legs.label')