Adding force to update routine

- Introduced Cache::NEVER Lock (never expiring lock)
- Force flag for dbstructure update
- Moving the business logic to central place in Update class

src/Core/Cache/ICacheDriver.php

@@ -34,7 +34,7 @@ interface ICacheDriver
 	 *
 	 * @param string  $key      The cache key
 	 * @param mixed   $value    The value to store
-	 * @param integer $ttl The cache lifespan, must be one of the Cache constants
+	 * @param integer $ttl      The cache lifespan, must be one of the Cache constants
 	 *
 	 * @return bool
 	 */