Add resolution_addr parameter to Ret2dlresolvePayload

[k4lizen]

This PR implements point number two from #2429 (thus it shouldn't close the issue).

• Adds an optional parameter called resolution_addr to Ret2dlresolvePayload making the loaders _dl_runtime_resolve function write the resolved function address to that location instead of the beginning of the payload (as is the default).

[k4lizen]

Can you add documentation for the parameter please? Best case would be to add an example on how and when to use it too.

I didn't write an example exploit using the ret2dlresolve binary but anyone who is writing the exploit manually will probably manage. Also added documentation for data_addr.