WIP: Support g_autoptr for the rest of public classes

Closed Leesoo Ahn requested to merge memnoth/libgfbgraph:master into master

These patches affect SimpleAuthorizer and GoaAuthorizer.

@debarshir Do we need a unittest for GoaAuthorizer? It makes sense to do so, but I don't think we must make extra code such as new-ing GoA object to pass to the parameter of the authorizer for only testing autoptr.

Edited by Leesoo Ahn

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