\Util to \utilphp\util

Signed-off-by: Gawain Lynch <gawain.lynch@gmail.com>
Add missing image parameter to attributes() macro
Updating lowlevelchecks. Allow 'postgresql' alongside 'postgres'.
Handle HTTP 403 errors separately to 404
Replace \utilphp\util::get_var() as it doesn't exist.
Merge pull request #1449 from GawainLynch/hotfix/utilphp

\Util to \utilphp\util
Merge pull request #1450 from GawainLynch/hotfix/editcontent_image

Add missing image parameter to attributes() macro
Merge pull request #1451 from GawainLynch/feature/Handle_HTTP_403

Handle HTTP 403 errors separately to 404
Merge pull request #1452 from GawainLynch/hotfix/Authenticate_login_provider

Replace \utilphp\util::get_var() as it doesn't exist.