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/lib/wailsjs/go/main/App.d.ts

@@ -18,6 +18,8 @@ export function GetStartupFile():Promise<string>;
 
 export function GetViewerData():Promise<main.ViewerData>;
 
+export function IsDebuggerRunning():Promise<boolean>;
+
 export function OpenDefaultAppsSettings():Promise<void>;
 
 export function OpenEMLWindow(arg1:string,arg2:string):Promise<void>;