Vendors. Support both consolidated and separate orders (split carts) #56
Description
Add an option that won't allow customers to place single orders with products of different vendors. We'll allow adding such products in the same cart. But a customer will choose products of which vendor he would like to process first (place an order). So products will be grouped by a vendor on the shopping cart page. Then a customer can choose what vendor products will be purchased first (split carts)
Similar to etsy (products in the cart are grouped by vendors, so a customer has to choose what vendor products he wants to purchase in the current order)
Let's make it configurable.
And when separate orders (split carts)" are enabled (so products from one vendor only could be in the same single order), then we can consider giving vendors more control to order management in admin area (e.g. see totals, manage shipping, etc)