Numeric Displays

[DanielStebbins]

Logic signals are integers, but only Boolean inputs and displays (logic indicators) are currently available. This issue adds a numeric display block capable of displaying a decimal digit (0 to 9). Placing several displays in a line should be treated as a line system with a single logic value. For example, 5 numeric displays placed horizontally with their front faces pointing the same direction should display a logic value of "1450" as the leftmost display being blank, then the others showing "1", "4", "5", and "0" as they move from left to right.