Helper for running code with copied local variables

[sovdeeth]

Description

Helper method to cut down on possible bugs when running an event with copied local variables.

Previous:

Variables.setLocalVariables(B, Variables.copyLocalVariables(A));
MY CODE HERE
Variables.setLocalVariables(A, Variables.copyLocalVariables(B));
Variables.removeLocals(B);

New:

Variables.withLocalVariables(A, B, () -> {
    MY CODE HERE
});

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Target Minecraft Versions: any
Requirements: none
Related Issues: none