Rigify To Unity Function

- This is an work in progress, this expands on the system that NyankoNyan and improves that system.

- It remaps the bone hierarchy to match Unity's expectations
- It adds necessary constraints to ensure proper bone movement (For the people who need it, can be removed via remove constraints button).
- It removes redundant bones that could cause issues in Unity.
- It renames bones to match Unity's Humanoid Avatar naming convention.
- It provides an option to merge or remove twist bones, which are not supported by Unity's humanoid system.
- It adjusts bone connections and deformation settings.

I think more needs to be added, but this seems to work for now.

ui/tools.py

@@ -10,6 +10,7 @@ from ..functions.mesh_tools import AvatarToolkit_OT_RemoveUnusedShapekeys
 from ..functions.seperate_by import AvatarToolKit_OT_SeparateByMaterials, AvatarToolKit_OT_SeparateByLooseParts
 from ..functions.additional_tools import AvatarToolKit_OT_ApplyTransforms
 from ..functions.armature_modifying import AvatarToolkit_OT_RemoveZeroWeightBones, AvatarToolkit_OT_MergeBonesToActive, AvatarToolkit_OT_MergeBonesToParents
+from ..functions.rigify_functions import AvatarToolKit_OT_ConvertRigifyToUnity
 
 @register_wrap
 class AvatarToolkit_PT_ToolsPanel(bpy.types.Panel):
@@ -47,5 +48,9 @@ class AvatarToolkit_PT_ToolsPanel(bpy.types.Panel):
             row = layout.row(align=True)
             row.operator(AvatarToolkit_OT_MergeBonesToActive.bl_idname, text=t("Tools.merge_bones_to_active.label"), icon='BONE_DATA')
             row.operator(AvatarToolkit_OT_MergeBonesToParents.bl_idname, text=t("Tools.merge_bones_to_parents.label"), icon='BONE_DATA')
+            row = layout.row(align=True)
+            row.operator(AvatarToolKit_OT_ConvertRigifyToUnity.bl_idname, text=t("Tools.convert_rigify_to_unity.label"), icon='ARMATURE_DATA')
+            row = layout.row()
+            row.prop(context.scene, "merge_twist_bones")
         else:
             layout.label(text=t("Tools.select_armature"), icon='ERROR')