Add disable use light in file checker

1.9.1

- fix: add error handling on palette linker when blend_path isn't valid anymore
- added: file checker entry, Disable all GP object `use lights` (True by default in addon pref `checklist`)
- added: WIP of Batch reproject all on cursor.
  - No UI. In search menu `Flat Reproject Selected On cursor` (idname `gp.batch_flat_reproject`)

properties.py

@@ -60,6 +60,11 @@ class GP_PG_FixSettings(bpy.types.PropertyGroup):
         description="Toggle on the use of show slider and sync range", 
         default=True, options={'HIDDEN'})
     
+    set_gp_use_lights_off : BoolProperty(
+        name="Set Off Use lights On All Gpencil Objects",
+        description="Uncheck Use lights on all grease pencil objects\nAt object level, not layer level (Object properties > Visibility > GP uselight)", 
+        default=True, options={'HIDDEN'})
+
     check_front_axis : BoolProperty(
         name="Check If Draw Axis is Front (X-Z)",
         description="Alert if the current grease pencil draw axis is not front (X-Z)",