- 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
- Replaced ternary notation with null coalescing version.
- Removed unnecessary semi-colon
- Replaced `<? echo` with short echo ``<?=`
- declared stay_open explicitly with `let`
- Updated PHPdocs
- Replaced force_download() from the CI3 download helper with CI4 version
- Removed unneeded using statements
- added needed call to db_connect()
- Removed parameter that matches the default value since it's redundant.
- Declared variable in view coming down from controller
- refactored javascript variable name to remove duplicate declaration warning
- Import missing class
