Added separation for automatic import to update and download new products.

Added separation for automatic import to update and download new products. Updating is carried out every 4 hours. And loading the catalog with new products, every 23 hours. You can specify the settings for Auto Import on the "Settings" page, in the "Shop" tab.

Added a function to insert Store Categories into the main menu (drop-down list).
Expanded the setting of the Number of added products per click.
Added the ability to set a limit for entries in child subcategories.