Template Paths in HTML

Added

• Initial release.
• HTML comment markers naming the Twig template, block and macro that rendered each part of the page.
• Blocks are marked on every render path, including {{ block('name') }}, {{ parent() }} and {% embed %} overrides.
• Optional requireLogin setting, via config/template-paths.php, restricting markers to logged-in users.
• Macros are marked with both their own name and their defining file.
• Active only when devMode is on, and only on site templates — never the control panel.