[PHPBB3-10746] Refactor db_tools and dbal code

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There are a few problems with code organisation related to DBAL etc.

Progress

1.	Create a base class where possible (e.g. mysqli.php and mysql.php)	Closed	Joas Schilling [X] (Inactive)
2.	Merge db_tools into dbal implementations	Closed	CHItA
3.	Get rid of db specific code in the application	Closed	Andreas Fischer [X] (Inactive)
4.	Create an interface for db\tools.php	Unverified Fix	Joas Schilling [X] (Inactive)
5.	Add factory for db tool class	Unverified Fix	Joas Schilling [X] (Inactive)