[Issue 24081] [Function countUntil] countUntil is a terrible name

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24081

--- Comment #1 from Basile-z <b2.temp at gmx.com> ---
I dont fully agree, here is why:

```
template indexOf(T)
if (isRandomAccessRange!T)
{
    alias indexOf = countUntil;
}
```

as you can see `indexOf` denotes _indexing_ capabilitites, but countUntil works
for all forward range.

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