Add getter/setter for mUserData on Character

[NEO97online]

CharacterVirtual has user data which can be retrieved with GetUserData and set with SetUserData.

However, Character is missing these methods (and arguably needs them more because its in the physics system..)

Character's constructor does take in a user data, but then its not accessible (at least from C bindings its not)

[jrouwe]

I did not provide convenience functions for every function on Body because it's very simple to do this:

physics_system->GetBodyInterface().GetUserData(character->GetBodyID())

or

physics_system->GetBodyInterface().SetUserData(character->GetBodyID(), ...)

(and I would assume that it will be similar in the C wrapper interface)

[NEO97online]

That works well enough, in the C wrapper as well. Thank you.

Just for clarification, is the user data passed into the CharacterVirtual constructor the same user data that would be retrieved here?

[jrouwe]

If you use an inner rigid body for CharacterVirtual then yes, that user data will be set on both the CharacterVirtual as well as on the rigid body.

If you're not using an inner rigid body then the user data is stored separately in CharacterVirtual and is unrelated to the user data of a rigid body (but you could treat them in the same way).