Support for prefixes

[JeremyEspresso]

I am not sure what the best possible way to implement this would be, however I know that support prefixes "natively" from the library would benefit everyone wanting to use the library.

[FiniteReality]

I'll probably implement this as an ICommandParser which decorates a previous ICommandParser instance. However, this would require that the DI container supports decoration... I could borrow a technique I used in one of my work-in-progress libraries, but it wouldn't be ideal, since it effectively means registering and unregistering services as the decorator chain is built.

[JeremyEspresso]

How about adding a separate attribute for it that could be replaced with or is in addition to the GroupAttribute?

[FiniteReality]

Prefixes aren't really part of the command, and a lot of times are configurable; adding them as attributes would make it awkward to configure dynamically at runtime.

[JeremyEspresso]

Fair enough.