[PATCH] Defeated players can still use the team chat

[elexis]

Defeated players can still use the private chat and team chat, since the player-assignment isn't updated.

This allows them to cheat without being noticed. Also they still have their old player color in the chat, intead of white for observers.

Same origin as in #3435.

[elexis]

Something like that. Work in progress.

[elexis]

Notice that we don't need the // Reveal the map for this player part anymore, since the user becomes an actual observer. Might help with performance, but more importantly it is misleading and an incorrect solution. The map will be revealed by setting that player to the actual observer mode.

If you switch the perspective using the developers tool, you will see that every area that the player has explored will still be explored, but not visible.

[elexis]

In 17771:

Add chat-addressee dropdown, refs #1767.
Add observer-only chat and allow private messages from observer to observer.
Prevent defeated players from using the team-chat, fixes #3441.