CSS: Remove uppercase transform on menu headings
Fix #17715: Manage Config should trim option name
phpdoc compress_api.php: remove incorrect @uses statement
Hide attachments in history if user can't see them

If user is not allowed to view attachments (i.e. their access level is
lower than $g_view_attachments_threshold), then the history should not
display information about attachments.

Fixes #17744
"Add and Edit Category" button

Introduces a new button to the Manage Projects and Edit Project pages,
similar to the existing "Add and Edit Version" feature.

Fixes #6444