[Dynamic Zones] Implement dz templates (#2345)

This allows shared tasks to create dz instances automatically through
the `dz_template_id` field instead of using quest scripts. Quest apis
were also added to create expeditions from template ids.

world/world_boot.cpp

@@ -408,6 +408,7 @@ bool WorldBoot::DatabaseLoadRoutines(int argc, char **argv)
 	database.PurgeExpiredInstances();
 
 	LogInfo("Loading dynamic zones");
+	dynamic_zone_manager.LoadTemplates();
 	dynamic_zone_manager.CacheAllFromDatabase();
 
 	LogInfo("Loading char create info");