New coding style option

Please add a coding style option to disable leading zeros from being removed in binary literals. It affects its readability. For example, when Pretty listing is enabled, you will not be allowed to write:
```vbnet
' Intended look
Select Case foo And &B00111111
Case &B00000100 :
Case &B00010000 :
Case &B00100001 :
End Select

' Actual
Select Case foo And &B111111
Case &B100 :
Case &B10000 :
Case &B100001 :
End Select
```
The only "hack" available right now is to use an underscore character, but that is not a very pretty looking syntax.
```vbnet
Select Case foo And &B_00111111
Case &B_00000100 :
Case &B_00010000 :
Case &B_00100001 :
End Select
```

The function responsible for this formatting is called [GetIntegerLiteralValueString](http://source.roslyn.io/#Microsoft.CodeAnalysis.VisualBasic.Workspaces/CodeCleanup/Providers/ReduceTokensCodeCleanupProvider.vb).