Support distinct objects

[jenniferplusplus]

At present, L.AP only has a single generic Object type. This is fine most of the time, but some objects, like Question have extended properties that will be missed. It's probably necessary to implement every enumerated object, for consistency.

[jenniferplusplus]

I'm not sure this is actually necessary? I was thinking I needed it to handle question, but that's actually an activity, which does support this type. Double check before working on it.