imporve and expose follow curve offset

2.1.1

- added: follow curve show offset property in UI
- added: follow curve show clickable warning if object has non-zero location to reset location
- changed: created follow curve use `fixed offset`

utils.py

@@ -1053,7 +1053,7 @@ def orentation_track_from_vector(input_vector) -> str:
 
     return orient
 
-def create_follow_path_constraint(ob, curve, follow_curve=False):
+def create_follow_path_constraint(ob, curve, follow_curve=False, use_fixed_location=True):
     '''return create constraint'''
     # # Clear bone follow path constraint 
     exiting_fp_constraints = [c for c in ob.constraints if c.type == 'FOLLOW_PATH']
@@ -1070,6 +1070,8 @@ def create_follow_path_constraint(ob, curve, follow_curve=False):
     const.target = curve
     if follow_curve:
         const.use_curve_follow = True
+    if use_fixed_location:
+        const.use_fixed_location = True
     return const
 
     ## on_bones: