Add `select` operation

[Redstonneur1256]

New instruction to quickly select between two variables without using jumps Example usage:select result notEqual x false a b

Maybe Conditional Set (setcond) would be a better name, setcond does sound like changing a condition similarly to setprop/setrule

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• [x] I have ensured that my code compiles, if applicable.
• [x] I have ensured that any new features in this PR function correctly in-game, if applicable.

[The4codeblocks]

you have problems with setcond? how about condset?

[kJNCwBUq]

Looks like ternary operator.