Windows OS fix.

Added import "ffmpeg Gui/convertor" to convertor_windows.go

src/handler/convertor_windows.go

@@ -3,6 +3,8 @@
 
 package handler
 
+import "ffmpegGui/convertor"
+
 func getPathsToFF() []convertor.FFPathUtilities {
 	return []convertor.FFPathUtilities{{"ffmpeg\\bin\\ffmpeg.exe", "ffmpeg\\bin\\ffprobe.exe"}}
 }