Modulo operator

[TimovVeen]

Simply adds a modulo (MOD) operation to the execution module. I think it fits alongside the MUL and DIV operations for technically being possible with some workaround, so this would give some convenience to the modulo enjoyers out there.

[fnuecke]

Sure, makes sense - and looks good to me! One ask though: would you mind also adding the documentation to at least the English in-game manual page of the execution module, so that people will know it exists? Thanks.

[TimovVeen]

Of course, forgot about the manual. I'll add it in a minute

[TimovVeen]

Added it :)

[fnuecke]

Thanks again!