Add user roles management page and update user permissions handling

- Created a new `user_roles.php` file for managing user roles and permissions.
- Implemented pagination, filtering, and sorting for user roles.
- Updated `users.php` to use the new authorization structure for permissions.
- Changed API version from v1 to v2 in `users.php` for user data retrieval.
- Modified `webhook_mollie.php` to include account hierarchy in license creation.
- Refactored invoice generation and email sending logic in `webhook_mollie.php`.
- Introduced a new `webhook_paypal.php` file to handle PayPal webhook notifications.
- Implemented payment status updates and license creation logic in `webhook_paypal.php`.
- Added helper functions for PayPal webhook signature verification and access token retrieval.

assets/scripts.js

@@ -124,7 +124,7 @@ async function connectDevice() {
         // Log connection failure details
         await logCommunication(`Serial connection failed: ${error.message || 'Unknown error'}`, 'disconnected');
         
-        if (openPort === 1){
+        if (openPort = 1){
           closePort();
           console.log("Closing port");
           alert("System is still trying to close the serial port. If this message continues to come up please refresh this page.");