Add support for ow2

[Zezombye]

So far we just need to replace "2 of each player per team" by "1 Tank 2 Offense 2 Support" in the lobby settings.

Also support the new maps/gamemodes.

Use an "#!ow2" directive.

[joksulainen]

Overwatch 2 provides both as an option with the latter being the default.