feat: update SDK and GUI versions, add debugger protection settings

- Updated SDK_DECODER_SEMVER to "1.3.0" and GUI_SEMVER to "1.2.4" in config.ini.
- Updated MailViewer component to handle PDF already open error and improved iframe handling.
- Removed deprecated useMsgConverter setting from settings page.
- Added IsDebuggerRunning function to check for attached debuggers and quit the app if detected.
- Enhanced PDF viewer to prevent infinite loading and improved error handling.

Co-Authored-By: Laky-64 <iraci.matteo@gmail.com>

frontend/src/routes/(app)/+page.ts

@@ -23,8 +23,7 @@ export const load: PageLoad = async () => {
             let emlContent: internal.EmailData;
             
             if (startupFile.toLowerCase().endsWith(".msg")) {
-                const useExt = settingsStore.settings.useMsgConverter ?? true;
-                emlContent = await ReadMSG(startupFile, useExt);
+                emlContent = await ReadMSG(startupFile, true);
             } else {
                 emlContent = await ReadEML(startupFile);
             }