feat: 切换后端至PaddleOCR-NCNN，切换工程为CMake

1.项目后端整体迁移至PaddleOCR-NCNN算法，已通过基本的兼容性测试
2.工程改为使用CMake组织，后续为了更好地兼容第三方库，不再提供QMake工程
3.重整权利声明文件，重整代码工程，确保最小化侵权风险

Log: 切换后端至PaddleOCR-NCNN，切换工程为CMake
Change-Id: I4d5d2c5d37505a4a24b389b1a4c5d12f17bfa38c

3rdparty/opencv-4.5.4/samples/cpp/example_cmake/CMakeLists.txt

@@ -0,0 +1,26 @@
+# cmake needs this line
+cmake_minimum_required(VERSION 3.1)
+
+# Define project name
+project(opencv_example_project)
+
+# Find OpenCV, you may need to set OpenCV_DIR variable
+# to the absolute path to the directory containing OpenCVConfig.cmake file
+# via the command line or GUI
+find_package(OpenCV REQUIRED)
+
+# If the package has been found, several variables will
+# be set, you can find the full list with descriptions
+# in the OpenCVConfig.cmake file.
+# Print some message showing some of them
+message(STATUS "OpenCV library status:")
+message(STATUS "    config: ${OpenCV_DIR}")
+message(STATUS "    version: ${OpenCV_VERSION}")
+message(STATUS "    libraries: ${OpenCV_LIBS}")
+message(STATUS "    include path: ${OpenCV_INCLUDE_DIRS}")
+
+# Declare the executable target built from your sources
+add_executable(opencv_example example.cpp)
+
+# Link your application with OpenCV libraries
+target_link_libraries(opencv_example PRIVATE ${OpenCV_LIBS})

3rdparty/opencv-4.5.4/samples/cpp/example_cmake/Makefile

@@ -0,0 +1,12 @@
+CXX ?= g++
+
+CXXFLAGS += -c -Wall $(shell pkg-config --cflags opencv)
+LDFLAGS += $(shell pkg-config --libs --static opencv)
+
+all: opencv_example
+
+opencv_example: example.o; $(CXX) $< -o $@ $(LDFLAGS)
+
+%.o: %.cpp; $(CXX) $< -o $@ $(CXXFLAGS)
+
+clean: ; rm -f example.o opencv_example

3rdparty/opencv-4.5.4/samples/cpp/example_cmake/example.cpp

@@ -0,0 +1,50 @@
+#include "opencv2/core.hpp"
+#include "opencv2/imgproc.hpp"
+#include "opencv2/highgui.hpp"
+#include "opencv2/videoio.hpp"
+#include <iostream>
+
+using namespace cv;
+using namespace std;
+
+void drawText(Mat & image);
+
+int main()
+{
+    cout << "Built with OpenCV " << CV_VERSION << endl;
+    Mat image;
+    VideoCapture capture;
+    capture.open(0);
+    if(capture.isOpened())
+    {
+        cout << "Capture is opened" << endl;
+        for(;;)
+        {
+            capture >> image;
+            if(image.empty())
+                break;
+            drawText(image);
+            imshow("Sample", image);
+            if(waitKey(10) >= 0)
+                break;
+        }
+    }
+    else
+    {
+        cout << "No capture" << endl;
+        image = Mat::zeros(480, 640, CV_8UC1);
+        drawText(image);
+        imshow("Sample", image);
+        waitKey(0);
+    }
+    return 0;
+}
+
+void drawText(Mat & image)
+{
+    putText(image, "Hello OpenCV",
+            Point(20, 50),
+            FONT_HERSHEY_COMPLEX, 1, // font face and scale
+            Scalar(255, 255, 255), // white
+            1, LINE_AA); // line thickness and type
+}