Mvc: Migrate class/mvc-module.php

To Fwlib\Mvc\AbstractModel
Cache: Rename method encodeVal() and decodeVal()

To encodeValue() and decodeValue()
Cache: Rename del() to delete()
Cache: Change $errorMessage to protected with getter method
Cache: Change $log to non-static protected with getter method
Cache: Rename expire() to isExpired()
Cache: Rename expireTime() to getExpireTime()
Cache: Rename key() to getKey() and add to interface
Cache: Split ver() to getVersion() and increaseVersion()