ODBC database support

- Support using ODBC over PDO
- Special workarounds for PHP bug #44643
- Introduced parameters autocasting
- New class SQLtxt to force a value not to be casted
Merge branch 'gecoweb'

Conflicts:
	framework/db/CDbConnection.php
	framework/web/CActiveDataProvider.php

Introduces ODBC support (yet to be tested on this version of Yii)