rename classes

[InfectedBytes]

At least one Manager class should be renamed, because it confuses users that there are two different classes with the same name.

[InfectedBytes]

I should probably go with something like GameJoltAPI and GameJoltUI.
Yes, it looks a bit strange and redundant if you use the fully qualified name (GameJolt.API.GameJoltAPI), but who uses the fully qualified name? exactly, no one.