Add list of standard resolutions to the settings in video menu
Fix bugs in spectator mode and removed unused FPCNs

First fix - now togglespect lets to return automatically to previously
spectated player, after spectating him, switching to "fly spectate" mode
and again to spectating players.
Second fix - now player doesn't land and stuck outside of new map,
when during spectating somebody map changed.
FCPNs are removed, because currently they aren't used.
add map vantage points

The vantage point is supposed to be a distinctive view on a map - like the
angle from which the preview picture was taken.

This commit adds three commands: clearvantagepoint, setvantagepoint and
gotovantagepoint. None has any parameters, all are only allowed in edit
mode. A map can only have one vantage point.