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/hal/slow_hal/impl.cpp

@@ -0,0 +1,33 @@
+#include "impl.hpp"
+
+int slow_and8u(const uchar* src1, size_t step1, const uchar* src2, size_t step2, uchar* dst, size_t step, int width, int height)
+{
+    for(; height--; src1 = src1 + step1, src2 = src2 + step2, dst = dst + step)
+        for(int x = 0 ; x < width; x++ )
+            dst[x] = src1[x] & src2[x];
+    return CV_HAL_ERROR_OK;
+}
+
+int slow_or8u(const uchar* src1, size_t step1, const uchar* src2, size_t step2, uchar* dst, size_t step, int width, int height)
+{
+    for(; height--; src1 = src1 + step1, src2 = src2 + step2, dst = dst + step)
+        for(int x = 0 ; x < width; x++ )
+            dst[x] = src1[x] | src2[x];
+    return CV_HAL_ERROR_OK;
+}
+
+int slow_xor8u(const uchar* src1, size_t step1, const uchar* src2, size_t step2, uchar* dst, size_t step, int width, int height)
+{
+    for(; height--; src1 = src1 + step1, src2 = src2 + step2, dst = dst + step)
+        for(int x = 0 ; x < width; x++ )
+            dst[x] = src1[x] ^ src2[x];
+    return CV_HAL_ERROR_OK;
+}
+
+int slow_not8u(const uchar* src1, size_t step1, uchar* dst, size_t step, int width, int height)
+{
+    for(; height--; src1 = src1 + step1, dst = dst + step)
+        for(int x = 0 ; x < width; x++ )
+            dst[x] = ~src1[x];
+    return CV_HAL_ERROR_OK;
+}