Allow customers to purchase some products by weight, such as deli meats, while retaining the ability to purchase others by "each". While not included in the first implementation, design will support addition of units.
Included:
UnitOfMeasure Model with 2 calculators:
- Each - wraps the standard existing product calculation
- Weight - Calculates cost based on decimal weight * price
Helper method for displaying the quantity message (for use after quantity input elements, each, ea., pounds, lbs).