Class CapabilityToken<T>

Inspired by TypeToken, use a subclass to capture generic types. Then uses a transformer to convert that generic into a string returned by getType() This allows us to know the generic type, without having a hard reference to the class. Example usage:

 public static Capability<IDataHolder> DATA_HOLDER_CAPABILITY = CapabilityManager.get(new CapabilityToken<>() {});