Streamlined the management of products/categories

[danieltaylor-nz]

Currently you have to go to vapps/PopcAdmin/Catalog/Category to create the category and then go to the store settings and search for it again to add it as a store category.

Here we can do that in one movement.

Same goes for creating child categories. Instead of creating on one screen and then adding here, we can create a child category and its rollup in one form. In addition, settings such as owner and type are inherited from the parent saving time and avoiding mistakes.

Finally, we can create and add a product to a category in one modal as well. Sensible defaults are used based on the category we are adding to.