Implement Software Upgrade Management API and Frontend Functionality

- Added software.php for managing software versions, including download and purchase actions.
- Created upgrade_paths.php for handling upgrade paths management.
- Developed user_licenses.php for managing user licenses.
- Introduced version_access_rules.php for managing access rules for software versions.
- Implemented frontend functions in functions.js for interacting with the software upgrade API.
- Added version_access.php for user access validation and license management.
- Created upgrades.php for displaying available upgrades and handling user interactions.
- Enhanced UI with responsive design and progress indicators for downloads and purchases.

assets/readdevice.js

@@ -78,7 +78,13 @@ async function connectSerial() {
         };
         await logCommunication(`Selected USB device - ${JSON.stringify(portDetails)}`, 'connected');
         
-        await port.open({ baudRate: 56700 });
+        await port.open({ 
+            baudRate: 56700,
+            dataBits: 8,
+            stopBits: 1,
+            parity: 'none',
+            flowControl: 'none'
+        });
 
         listenToPort();