* Improve code style and PSR-12 compliance
- refactored code formatting to adhere to PSR-12 guidelines
- standardized coding conventions across the codebase
- added missing framework files and reverted markup changes
- reformatted arrays for enhanced readability
- updated language files for consistent styling and clarity
- minor miscellaneous improvements
- Format percentage per locale rules
- Moved constants to Constants.php
- Added PHPdoc comments
- Refactor code for clarity and simplicity.
- Added decimal formatting per locale for display.
- autoload locale helper
- Remove unneeded calls to helpers
- Removed unneeded comments
- fixed errors causing checks in parse_decimals to return false due to locales which use a comma.
- Barcode content is item_id if barcode_number is empty.
- Styling fixes
- Bump picquer/php-barcode-generator version to 2.4.0
- Ported over Receipt Barcode Generation
- 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
