V9 class for Symfony's IpUtils

[mlocati]

@linuxoid

Is there a list of everything the app() can create with short notations

Nope: you should take a look at the [Something]ServiceProvider.php files in the concrete/src directory
For example:

• concrete/src/Validation/ValidationServiceProvider.php defines 'token'
• concrete/src/Permission/PermissionServiceProvider.php defines 'IPLib\Address\AddressInterface'