- Added conversion to migration file for delimiter in image_allowed_types
- Corrected business logic for image upload in items form.
- Removed log message used for debugging.
- Replaced '|' with ',' in image_allowed_types save/populate.
- Replaced TRUE/FALSE constants with true/false keywords
- Replaced NULL constant with null keyword
- Replaced `<?php echo` in views with shortened `<?=`
- Added missing variable declaration
- Added missing function return type in declaration
- replaced `== true`, `== false`, `=== true` and `=== false` in if statements with simplified forms
