Idea: Labels and goto should be allowed to take parameters

[porky11]

Simple usage to simplify return:

if some_condition
{
    // supplies 1 and 2, will return 2
    goto return 1, 2;
}
else
{
    // supplies 2 and 3, will return 6
    goto return 2, 3;
}

// labels might take multiple parameters
return (x: i32, y: i32):
    x * y