Add in the steam networking updates from TF2's updates on May 13, 2025 into Src SDK 2013 MP/ and possibly other source games

[GrubPL]

So I've noticed that on May 13th TF2 got more detailed options for server visibility, and made the "map" console command not create a server anyone could join, but the SDK has not received these changes, alongside any other source game

Also, if you're not planning on doing that, at least say why, because i see no reason why these QoL changes should be kept on TF2

[SanyaSho]

You can switch SSDK2013 branch to "prerelease" bc it already has these changes

$ strings bin/x64/engine.dll | grep sv_friends_only
sv_friends_only

$ strings bin/x64/engine.dll | grep sv_allow_server_
sv_allow_server_adverisement_to_master_server