Use a new subdomain ipv4.cosinegaming.com, which contains the same IP
but only IPv4, so that godot will not try to use IPv6, which it cannot
do (it fails Error #2).

See https://github.com/godotengine/godot/issues/18275 for details on
that godot bug.

Because the setting to enable it is in the project.godot, there's no way
to keep that out of source control, but there is a way to keep this out
so here it is.

I want to compare this to the default ability

If a player looks at you or a wall you built, you gain charge, and steal
it from them!

Then, building walls now costs 15 charge.

I think this makes us all set for merge to master!

Infinite loop in start_game caused by set_info setting the wrong peer's
info. Making the RPC more explicit about who we're setting resolves
this.

One problem remains: start_game behaves the same whether a game has
started or not.