Fix output messages in console

Fixes:
1. show time remaining in system console after each minute;
2. correct form of "minute(s)";
3. show info "everyone died!" instead of "team SPECTATOR has won
the round!" in demo mode;
4. show correct info to which team was player forced (name of team),
when player1 is spectator.
Add the clock to scoreboard and change clockdisplay

Commit shows time in format mm:ss in scoreboard, instead of
"X minutes remaining" info.
It also enables default the clock on the HUD and adds clockcount variable,
which let to choose between counting forward or backward in the clocks.