Add NPC Max Aggro Distance to zone table

utils/sql/db_update_manifest.txt

@@ -380,6 +380,7 @@
 9124|2018_07_09_tasks.sql|SHOW COLUMNS FROM `tasks` LIKE 'type'|empty|
 9125|2018_07_20_task_emote.sql|SHOW COLUMNS FROM `tasks` LIKE 'completion_emote'|empty|
 9126|2018_09_07_FastRegen.sql|SHOW COLUMNS FROM `zone` LIKE 'fast_regen_hp'|empty|
+9127|2018_09_07_NPCMaxAggroDist.sql|SHOW COLUMNS FROM `zone` LIKE 'npc_max_aggro_dist'|empty|
 
 # Upgrade conditions:
 # 	This won't be needed after this system is implemented, but it is used database that are not

utils/sql/git/required/2018_09_07_NPCMaxAggroDist.sql

@@ -0,0 +1 @@
+ALTER TABLE `zone` ADD `npc_max_aggro_dist` INT NOT NULL DEFAULT '600';