Switch more PHP files to use the DBAL.

More database updates.

Update database code in a few more script files.

Start re-working admin styles in SASS.

Move admin CSS into a subdirectory.

Update more admin pages to use DBAL functions.

Declare parameter types and fix a typo.

More updates to rants and pages.

Update pages and rants to use DBAL.

Update rsspost() and tweak some stuff in html.php.