Performance when adding items to promotion (RTC-16867)

For user who triggered import of items to promotion, loading page is refreshed immediately after import is finished. For other users who are waiting on loading page, refresh will happen in less than 4 seconds after items are added.

Copy of promotion (RTC-17340)

Category field is copied when copying promotion. If source promotion has category, its value can be changed on 'copy promotion' page.

Promotion type (RTC-15420)

There is Promotion type field in promotion details view. It is visible only when Promotion type is set for promotion. Promotion types are specified in 'Promotion type' register. If a Promotion type is set as default in register, it will be chosen when creating new promotion. Promotion type can be changed in 'Edit promotion details' modal but it is not a required field. When copying promotion, Promotion type can be selected, and saved to the copy. This field is exported to POS.