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/__init__.py

@@ -1,18 +0,0 @@
-from ..core.register import register_wrap
-
-#to reload all things in this directory and import them properly - @989onan
-if "bpy" not in locals():
-    import bpy
-    import glob
-    import os
-    from os.path import dirname, basename, isfile, join
-    modules = glob.glob(join(dirname(__file__), "*.py"))
-    for module_name in [ basename(f)[:-3] for f in modules if isfile(f) and not f.endswith('__init__.py')]:
-        exec("from . import "+module_name)
-        print("importing " +module_name)
-else:
-    import importlib
-    modules = glob.glob(join(dirname(__file__), "*.py"))
-    for module_name in [ basename(f)[:-3] for f in modules if isfile(f) and not f.endswith('__init__.py')]:
-        exec("importlib.reload("+module_name+")")
-        print("reloading " +module_name)