Integer Logic Signals

[DanielStebbins]

Currently, the logic system uses Boolean values: on and off are the only available states of a logic group.

To allow for easier logistics, the game should allow for numeric signals, which can later represent, for example, item counts, energy percentage, a rate of fluid production, etc.

Requirements:

• Logic producers should output a signed integer (i32?) instead of a boolean, which should be tracked in the LogicGroup's HashMap of producers. The LogicGroup's "on()" function should then add the signals of its producers instead of taking the logical OR of them.
• Blocks that expect Boolean logic inputs/outputs (logic gates, logic indicators) should conform to the standard that a signal of 0 is "off" and any other signal is "on".
• New comparison and arithmetic blocks become possible with this change. This issue should add at least an Adder, Subtractor, Invertor (single-input block that flips the sign of the input signal, not to be confused with a NOT gate), and a comparator (two-input block which outputs "on" if a specific one of its inputs is higher than the other).
• The Logic On block should now output some constant, which can be set and checked by the player (probably requires a GUI).
• The Logic Indicator block should provide a way to view the exact signal (probably requires a GUI, could be the same as the Logic On block but immutable).