Word limits, select all option groups, and general bug fixes

Improvements

• You can now set a word limit on text field and large text field options.

• A "Select all" function has been added when applying options to option groups, making it faster to apply an option across every group at once.

Bug fixes

• The Edit Options modal now displays correctly above other page elements on the "Atelier" theme, fixing a layering issue that could leave it partially hidden.

• Image swatch selections that update the product image without an additional charge are now saved correctly on Shopify Plus stores.