The login server now sends live checks.

This should stop server providers from kicking tutorial players as
inactive TCP connections. The interval is generous for that reason.

Also snuck in a change that makes mobs retreat all the way to their
spawn points, to aid during mob gruntwork with /toggleai.

src/MobManager.cpp

@@ -419,7 +419,8 @@ void MobManager::retreatStep(Mob *mob, time_t currTime) {
     }
 
     // if we got there
-    if (distance <= mob->data["m_iIdleRange"]) {
+    //if (distance <= mob->data["m_iIdleRange"]) {
+    if (distance <= 10) { // retreat back to the spawn point
         mob->state = MobState::ROAMING;
         mob->appearanceData.iHP = mob->maxHealth;
         mob->killedTime = 0;