[calc] evaluations

[alexander-bauer]

When a calculation is performed, but it is also paired with a boolean evaluation, Distru should indicate whether the evaluation is true or false. For example, 2 * 10 == 20 would result in true. Similarly, 2 * 10 == 4 * 5 should also evaluate properly. >, <, >=, and <= should also be implemented.

[lukevers]

I also want to add more basic functions, like !, square root, ^, et cetera. If anyone has more ideas, write them here.

[lukevers]

I'm just using random numbers as an example for each of these.

Absolute Value: abs -18 ... 18
Factorial: 5! ... 120
Square Root: sqrt 4 ... 2
Power: 4^3 ... 64