Implemented player tick (health/nano stamina).

* The player now heals while not in combat
* Nanos lose stamina while active, regain it while resting
* Using active nano powers drains stamina
* Standing in FM patches/lakes now deals damage
* Fixed a memory error in npcAttackPc()
* Mobs now aggro when a player gets close
* Mobs now give up the chase if the player gets out of the combat zone;
they no longer try chasing until they themselves have left it
* Added a few missing break statements in the loops in BuddyManager

Other players are not yet instantly notified of health/stamina updates,
as finding the correct way to do this has proven tricky. FM patch damage
updates other player's views just fine, though.

src/Database.cpp

@@ -427,6 +427,9 @@ Player Database::DbToPlayer(DbPlayer player) {
     result.equippedNanos[1] = player.Nano2;
     result.equippedNanos[2] = player.Nano3;
 
+    result.dotDamage = false;
+    result.inCombat = false;
+
     result.iWarpLocationFlag = player.WarpLocationFlag;
     result.aSkywayLocationFlag[0] = player.SkywayLocationFlag1;
     result.aSkywayLocationFlag[1] = player.SkywayLocationFlag2;