Add compile option to use YOLOv8 ONNX models for testing.

- added qmake option yolo_onnx to use normal YOLOv8 ONNX models. This makes possible to test
  gimbals camera inside without real model.
- reduced confidence threshold requirement in AiEngineInferencevOnnxRuntime from 0.5 to 0.2
- make printing prettier with ONNX Runtime
- removed unnecessary cv::Mat::clone()

Type: Improvement
Issue: https://denyspopov.atlassian.net/browse/AZ-39

misc/rtsp_ai_player/rtsp_ai_player.pro

@@ -15,15 +15,21 @@ else {
     message("Not using real gimbal camera.")
 }
 
+yolo_onnx {
+    QMAKE_CXXFLAGS += -DYOLO_ONNX
+}
+
 opi5 {
     message("OPI5 build")
+    CONFIG += link_pkgconfig
     PKGCONFIG += opencv4 librga stb libturbojpeg
     INCLUDEPATH += /usr/include/rga
     QMAKE_CXXFLAGS += -DOPI5_BUILD
     LIBS += /usr/local/lib/librknnrt.so
     SOURCES += $$PWD/src-opi5/*.c $$PWD/src-opi5/*.cpp $$PWD/src-opi5/*.cc
     HEADERS += $$PWD/src-opi5/*.h
-} else:opencv {
+}
+else:opencv {
     message("OpenCV build")
     message("You must use YOLOv8 ONNX files. Azaion model does not work!")
     message("OpenCV must be version 4.10.0 installed to /usr/local/")