[Proposal] Inclusion in the for loop of keyword "Until".

In VB, the for loop is not as flexible as the for loop of other languages, for example, C#.

In vb, there is this loop:
```
Dim uA as Integer
For uA = 0 to 5
Console.WriteLine(uA+",")
Next uA
' Print:
' 0,1,2,3,4,5
```

There could also be this form:

```
Dim uA as Integer
For uA = 0 Until 5
Console.WriteLine(uA + ",")
Next uA
' Print:
' 0, 1, 2, 3, 4
```

Notice the difference between "to" and "until".
"To" is inclusive, "Until" is exclusive.

```
For uA = 0 Until 5
Next uA
```

It's similar to construction in C#:
```
for(uA = 0; uA < 5; uA++) {}
```

For me, the construction with Until is more readable than the form below in VB:
```
Dim limit as Integer
Dim uA as Integer

For uA = 1 to limit - 1
Next uA

With 'Until', it becomes less verbose:
For uA = 1 Until limit
Next
```

On MonkeyX, Monkey2 and CerberusX, what are language based on Basic, this construction exist.