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`

__init__.py

@@ -4,7 +4,7 @@ bl_info = {
 "name": "GP toolbox",
 "description": "Tool set for Grease Pencil in animation production",
 "author": "Samuel Bernou, Christophe Seux",
-"version": (2, 1, 0),
+"version": (2, 1, 1),
 "blender": (3, 0, 0),
 "location": "Sidebar (N menu) > Gpencil > Toolbox / Gpencil properties",
 "warning": "",