Create game as spectator

[ebbit1q]

Short roundup of the initial problem

This seems to be a useful feature for tournament organisers, allowing to create a game for participants

What will change with this Pull Request?

• allow creation of games as spectator
• add settings and menu items for this
• allow elevated users to create games as spectator in judge mode without limit
• allow setting the limit to 0 effectively disallowing other users to create games
• change the function for automatically closing inactive games to check for the presence of an active host player instead of counting players, this prevents games being closed automatically while the host is spectating
• allow users to see 0 player games in the games list
• disallow the transfer of the host status to spectators, this caused strange issues where the host status wasn't properly signaled, this issue is also present on master but is harmless, I don't think users rejoining a game as spectator should be given host status

Screenshots