Define variables for metaclasses

[mostobriv]

I think workflow should create all related variables not only for classes but for their metaclasses also. Current implementation for some reason only analyse metaclass, but completely ignores definition of it.

https://github.com/Vector35/workflow_objc/blob/3bbf294dba4c46a8e42a426ea4f561a72896a2b6/InfoHandler.cpp#L277-L291

At least it should define:

• objc_class_t variable at metaclass address
• objc_method_list_t variable at method list address inside the metaclass