Core/Commands: Allow muting offline players - the mute will become effective on next player login.

sql/updates/auth/2011_07_27_00_auth_account.sql

@@ -0,0 +1 @@
+ALTER TABLE `account` CHANGE `mutetime` `mutetime` bigint(40) NOT NULL DEFAULT 0;

sql/updates/world/2011_07_27_01_world_trinity_string.sql

@@ -0,0 +1,2 @@
+INSERT INTO `trinity_string` (`entry`,`content_default`) VALUES 
+(283,'You have disabled %s\'s chat for %u minutes, effective at the player\'s next login. Reason: %s.');