Add custom disconnection dialog when version mismatch is a likely cause

[mibac138]

A rather niche issue, but probably won't hurt to have it. Not sure if the DebugActions are worth it, probably overkill?

Without Steam:

With Steam:

[notfood]

People who encounter this are most likely not playing with Steam.

The debug actions are overkill, when are we going to use that?

[mibac138]

The debug actions are overkill, when are we going to use that?

Yeah, thought as much. I just used them to create this and it was useful in the short span of time I was creating this :)

People who encounter this are most likely not playing with Steam.

I do agree, but sometimes Steam is wonky with mod updates and refuses to acknowledge a mod update is available. I had this issue once and calling SteamUGC.DownloadItem made Steam actually detect (and download) the update. Though that's probably not a particularly common case, so I'm fine with removing it if you're against it

[notfood]

That note should be sufficient. The multiplayer mod doesn’t update often enough and protocol doesn't break with every update for this to be an issue, so a force update button shouldn't be necessary.

[mibac138]

Yup, removed it :)

[notfood]

Don't forget to PR Multiplayer-Locale