Rename activities to task_activities for consistency since we're changing up task data

utils/sql/git/required/2018_07_09_tasks.sql

@@ -19,3 +19,4 @@ ALTER TABLE `activities` DROP COLUMN `text3`;
 ALTER TABLE `activities` DROP COLUMN `zoneid`;
 ALTER TABLE `tasks` DROP COLUMN `startzone`;
 ALTER TABLE `tasks` ADD `faction_reward` INT(10) NOT NULL DEFAULT '0';
+RENAME TABLE `activities` TO `task_activities`;