Remove Gamespy without influence

[T-MaxWiese-T]

Gamespy has disabled its services, so SEF does not need Gamespy Profile anymore.

[T-MaxWiese-T]

Tested and I could not find any errors.

[eezstreet]

Is there a noticeable difference ingame when it is removed? I agree that Gamespy stuff should removed and I will review this PR but I am curious if there is a tangible difference either way with the code being in there or not.

[T-MaxWiese-T]

So this PR only aims to remove the GamespyProfilePopup because you can no longer login with the GamespyProfilePopup. What are the advantages? I would say that it cleans the code which is always a great thing. And if this popup appears the player will not be confused. So I don't think I've ever seen this popup before, but it shows that it's unnecessary. Of course you could remove Gamespy completely but I don't know how much dependencies there are in multiplayer so I'll leave it at that for now. I know now that the internet mode is partly dependent on Gamespy entries. That means you would probably have to rename and adapt a lot.

[T-MaxWiese-T]

So I suggest to test the existing changes first. I can't find any differences concerning the serverlist. However, I can't load missions with the SEF GitHub version so I can't join any server. I assume that these changes have no effect. Once the changes are tested I can continue and then I could try to remove the last remnants of Gamespy and adjust it, for example renaming the GameSpy buttons in the server menu.