new command looplisti

same as looplist, but it automatically counts the loops in "i", starting
with 0.

Example:

  a = [u v w] ; b = [x y z]
  looplisti $a m [echo $m (at $b $i) $i]

  u x 0
  v y 1
  w z 2

DOCREF looplisti

source/src/clientgame.cpp

@@ -1051,7 +1051,7 @@ void preparectf(bool cleanonly=false)
             if(e.type==CTF_FLAG)
             {
                 e.spawned = true;
-                if(e.attr2>=2) { conoutf("\f3invalid ctf-flag entity (%i)", i); e.attr2 = 0; }
+                if(e.attr2>=2) { conoutf("\f3invalid ctf-flag entity (%d)", i); e.attr2 = 0; }
                 flaginfo &f = flaginfos[e.attr2];
                 f.flagent = &e;
                 f.pos.x = (float) e.x;