Add functionality to save inference images for the debugging purposes.

Save bmp images of inference results to /tmp as bmp files. BMP was
chosen to reduce encoding time. Saving is fully threaded. It can be
enable with qmake CONFIG+=save_images option

Also:
  - use antialised fonts in RKNN inference
  - moved class strings to inference base class
  - fixed silly segfault in ONNX inference
  - prevent writing results if class if exceeds valid values

Issue: https://denyspopov.atlassian.net/browse/AZ-38
Type: Improvement

misc/rtsp_ai_player/src-onnx-runtime/aiengineinferenceonnxruntime.h

@@ -17,5 +17,4 @@ public slots:
 private:
     cv::Mat drawLabels(const cv::Mat &image, const std::vector<Yolov8Result> &detections);
     YOLOPredictor mPredictor;
-    QVector<QString> mClassNames;
 };