feat: output gamedig options in a "dry-run" and add protocol and type to output

[dgibbs64]

What is this feature about?
I have an issue whereby I would like to query a master server such as Steam or 333networks. However, I only want to query if using the relevant protocol.

I query the master servers to try and identify the query port first to cut down on query guesses (relates this this request #484). I noticed that --debug outputs all the gamedig options for the query before running it. Part of it outputs procotol: valve which is exactly the info I need.

Would it be possible to add a feature that simply outputs to json the gamedig options without running a query? Almost like a dry-run. This way I could check gamedig to confirm the protocol, then query the master server if valve, or gamespy , and finally do an actual query with the query port gathered from the master server.

This will create a lot of flexibility as currently, I would have to manually list all GameSpy games in an if statement to prevent non-gamespy servers from checking 333networks.

Finally it would also be good to add the protocol and type to the query output as I would like to display the protocol type used for users to see.

Thank you