Allow using IEqualityComparer(Of T) in Select...Case-Statements

If someone wants to match a string case-insensitive in a `Select`-Statement, he is more or less forced to convert the string to lower or upper case.

```
Select Case tagName.ToLower()
Case "a"
Case "p"
Case else
End Select
```

The .NET-Framework offers the` IEqualityComparer(Of T)`-Interface, and corresponding StringComparer-Implementations, to allow different types of equality checks.

It would be perfect, if we could use

```
Select Case tagName With StringComparer.OrdinalIgnoreCase
Case "a"
Case "p"
Case Else
End Select
```

A slightly more functional style would use a `Comparer(Of T)`-style method

```
Select Case tagName With Function(x,y) StringComparer.OrdinalIgnoreCase.Compare(x,y)
Case "a"
Case "p"
Case Else
End Select
```

alternatively expressed as

```
Select Case tagName With AddressOf StringComparer.OrdinalIgnoreCase.Compare
Case "a"
Case "p"
Case Else
End Select
```