aim: look at last enemy origin when just loosed focus

fix: saving bot practice took enormous amount of time when changing level on large practice database
refactor: changed random number generator usage

src/sounds.cpp

@@ -152,7 +152,7 @@ void BotSounds::simulateNoise (int playerIndex) {
       }
    }
    else {
-      if (mp_footsteps.bool_ ()) {
+      if (mp_footsteps) {
          // moves fast enough?
          noise.dist = 1280.0f * (client.ent->v.velocity.length2d () / 260.0f);
          noise.last = game.time () + 0.3f;