create PlayerManager static class

src/engine/objects/Mob.java

@@ -1130,7 +1130,7 @@ public class Mob extends AbstractIntelligenceAgent {
         if (this.ownerUID == 0)
             return null;
 
-        return PlayerCharacter.getFromCache(this.ownerUID);
+        return PlayerManager.getFromCache(this.ownerUID);
     }
 
     public void setOwner(PlayerCharacter value) {