Change how price levels work

If you are setting up an integration, such as UberEats, and would like to add 10% to the prices on your menu, the current method requires that you create a price level on every item. So the restaurant that I am doing this for has 463 items. We should be able to add 10% to the menu, automatically rounding the the nearest nickel or dime, all in one step. This is already how it is done for modifiers and it should be the same thing for menu items. This will happen very often in the new landscape. It will be a deal breaker for any merchant who knows this before choosing Linga.