Enforce function returns at compile time

[Vurv78]

Instead of doing a runtime check for functions returning values, (which would bring a minor amount of overhead to E2 functions), now they will be checked at compile time if they return.

This won't compile

function string test() {}

This function marked to return 'string' must return a value

But these two cases will (Featuring some cheeky logic to make if and switch statements mark the above scope as dead if all cases return and there is an else / default case)

function number increment() {
    if (Ran) {
        error("Ran twice")
    } else {
        Ran = 1
        return 1
    }
}

function number good(N:string) {
    switch (N) {
        case "E2",
            return 1
        default,
            return 0
    }
}

Changes to OPS

This also lowers base cost of userfunctions to 10 ops.