(RTM-882) Fetch purchase history for member in the background - technical release notes

Information such as bonuses or purchase history is fetched later, which significantly speeds up member opening.
This user will experience as a time improvement regarding opening member information. 

(RTM-8954) Updating member 

Members can be updated and saved if loyalty system allows this. 

(RTM-2740) Send digital receipts

Ensured digital receipts are sent even if no member is added to the receipt. 

(RTM-3918) Placeholder image

If an item does not have a image, there is no placeholder image shown in item details. 
This gives user a better overall view of item details instead of a placeholder image included. 

(RTM-8730) Improved color in loading indicator

The loading indicator shown in several places in Mobile POS when loading has a new improved green color so it will be easier to see.