server: setPlayerInvisible(id, mode)
I propose functionality to make players invisible to all other players. Invisible players are still able to see other visible players in the same virtual world, but can't be seen/heard by anybody.
This feature is very useful for moderators and admins, especially when doing RP, and was present in G2O before it's relaunch.
void setPlayerInvisible(int id, bool mode) // sets player with given id to visible/invisible, depending on mode bool getPlayerInvisible(int id) // returns whether the given player is invisible