Revert da48d5debd20967cd04733987e074b5c0189efd5
Fix #1078 Builder localStorage conflict
Added bfmysqli driver to improve mysqli support

Allows improved mysqli support without changing the CodeIgniter code.
Simply set the database config as if you were configuring it for mysqli,
but change the 'dbdriver' to 'bfmysqli'.
Database module support for bfmysqli driver, language updates, CSS

- Added support to the database module for the bfmysqli driver.
- Changed language files to use `database_` prefix instead of `db_`
prefix to prevent conflicts with CodeIgniter's language files.
- Moved CSS out of the views.