Add enhanced schedule management for background tasks (#267)

gaseous-server/Support/Database/MySQL/gaseous-1016.sql

@@ -0,0 +1,6 @@
+ALTER TABLE `Settings` 
+ADD COLUMN `ValueType` INT NULL DEFAULT 0 AFTER `Setting`,
+ADD COLUMN `ValueDate` DATETIME NULL DEFAULT NULL AFTER `Value`;
+
+ALTER TABLE `GameState`
+ADD COLUMN `Zipped` BOOLEAN NOT NULL DEFAULT 0;