:title
list_filter

:sig
Use filter(StringList items, function<bool (String)> f)

:see
filter
StringList

:content
`list_filter()` was removed because `StringList` is `std::vector<String>` and the generic `filter()` helper covers the same behavior without a second implementation to maintain.

Use:

```cpp
auto visible = filter(routes, [](String s) { return(s != "admin"); });
```
