Infrastructure Auto DNS: Preconfigured per-game infrastructure DNS through JSON

[hrydgard]

This proposes a way to specify per-game DNS resolution through a json file, that we will later make updatable from the PPSSPP website.

Fixes #19848

Don't plan to merge this until I've implemented auto-update and caching of this file, but please feel free to let me know your opinions @anr2me and others :)

The JSON file:
https://github.com/hrydgard/ppsspp/blob/c83636c306f68f8918f1f9db1fecf10e53579083/assets/infra-dns.json

This also removes the ability to specify "secondary DNS".

[anr2me]

As i remembered there are games that use the Secondary DNS server too, not sure why, may be because my internet have too many lost packet rate back then and the game failed to get a reply from primary server 🤔
I ended setting it to 0.0.0.0 to prevent the game from using it (it used to be 8.8.8.8, which probably a bad idea, since it will resolve to official server)

[a-blondel]

Maybe you would like to include a DDNS name (when existing) to automatically check IP changes (eg ablondel.ddns.net for MoHH/MoHH2).

The supported game versions are listed here :
https://github.com/a-blondel/mohh-master-server/blob/main/src/main/java/com/ea/utils/GameVersUtils.java (see SLUS_MOHH_PSP_PAL and SLUS_MOHH_PSP_NTSC constants for MoHH)
I may remove the need to check for the game version, this was a prevision in case we split the servers by region for latency issues (as it was back then with official servers).

You'll also find supported versions for MoHH2 (SLUS_MOHH2_PSP_PAL and SLUS_MOHH2_PSP_NTSC) if you want to add it to the list, but for the "comment" on your JSON, only the online menu is accessible yet. The domain entry pspmoh08.ea.com that you added is for MoHH2.

I may not be aware of every versions of the games, I can add any that is missing, as of today no users reported problems. Also note that some versions of the games don't have online features (at least, it was cut from JP and AU regions for MoHH2).

[hrydgard]

Cool, I'll add entries for MOHH2.

Yeah, I can add a DNS lookup so the json can just contain a domain instead.

[hrydgard]

Actually, I think I want to get this in as-is, and on top, add the download + file cache. It works quite well currently, just doesn't auto-update yet.