Add FFplay support to the application

Integrated FFplay functionality across the application. This includes support for setting up the FFplay path and invoking FFplay for media playback.

convertor/view.go

@@ -18,7 +18,8 @@ type ViewContract interface {
 	SelectFFPath(
 		ffmpegPath string,
 		ffprobePath string,
-		save func(ffmpegPath string, ffprobePath string) error,
+		ffplayPath string,
+		save func(ffmpegPath string, ffprobePath string, ffplayPath string) error,
 		cancel func(),
 		donwloadFFmpeg func(progressBar *widget.ProgressBar, progressMessage *canvas.Text) error,
 	)