[MIG] web_dashboard_tile from 12.0 to 16.0

- remove 12.0 migration scripts
- bump version to 16.0
- use new api convention @api.model_create_multi ; new compute function logic ;
- add dependency to spreasheet_dashboard to use 'Dashboard' main menu item
- use new way to include assets
- remove totally useless controllers
- distinct different errors, depending on domain or format errors
- fix : _compute_data depends on many fields
- update : documentation and printscreens

web_dashboard_tile/models/tile_category.py

@@ -82,12 +82,11 @@ class TileCategory(models.Model):
             if category.action_id:
                 category.action_id.unlink()
 
-    @api.model
-    def create(self, vals):
-        category = super().create(vals)
-        if category.active:
-            category._create_ui()
-        return category
+    @api.model_create_multi
+    def create(self, vals_list):
+        categories = super().create(vals_list)
+        categories.filtered(lambda x: x.active)._create_ui()
+        return categories
 
     def write(self, vals):
         res = super().write(vals)
@@ -105,4 +104,4 @@ class TileCategory(models.Model):
 
     def unlink(self):
         self._delete_ui()
-        super().unlink()
+        return super().unlink()