More cleanup

- operator strings are referenced via the class property rather than a hard coded string
- class names have been cleaned to have _OT_ or _PT_ depending on the kind of class it was.
- Class names should mostly be CamelCase now.

ui/panel.py

@@ -2,13 +2,15 @@ import bpy
 from ..core.register import register_wrap
 from ..functions.translations import t
 
+CATEGORY_NAME = "Avatar Toolkit"
+
 @register_wrap
-class AvatarToolkitPanel(bpy.types.Panel):
+class AvatarToolKit_PT_AvatarToolkitPanel(bpy.types.Panel):
     bl_label = t("AvatarToolkit.label")
     bl_idname = "OBJECT_PT_avatar_toolkit"
     bl_space_type = 'VIEW_3D'
     bl_region_type = 'UI'
-    bl_category = "Avatar Toolkit"
+    bl_category = CATEGORY_NAME
 
     def draw(self, context):
         layout = self.layout