Experimental: Adding some fsanitize flags, a new example exe, a mutex on FFmpegReader::Close, and some additional clean-up code on AddImage (when a previous image exists)

src/Frame.cpp

@@ -753,6 +753,10 @@ void Frame::AddImage(
 	int new_width, int new_height, int bytes_per_pixel,
 	QImage::Format type, const unsigned char *pixels_)
 {
+    if (has_image_data) {
+        // Delete the previous QImage
+        image.reset();
+    }
 
   // Create new image object from pixel data
 	auto new_image = std::make_shared<QImage>(