Revert "db: use builtin classloader, lowercase class files"

This reverts commit 57b8469e674ef082c30b7d1de40d5d53d50b251b.
Revert "Rewrote database support to classes, Fixed strict warning in sanitizedummy.php"

This reverts commit 65d0cc64a2ca1ce259fbba501b13deaf1870e540.
release 1.7.4