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/cmake/checks/runtime/cpu_vsx_aligned.cpp

@@ -0,0 +1,56 @@
+// check sanity of vsx aligned ld/st
+// https://github.com/opencv/opencv/issues/13211
+
+#include <altivec.h>
+#undef bool
+
+#define vsx_ld vec_vsx_ld
+#define vsx_st vec_vsx_st
+
+template<typename T>
+static void fill(T& d, int from = 0, int to = 16)
+{
+   for (int i = from; i < to; i++)
+        d[i] = i;
+}
+
+template<typename T, typename Tvec>
+static bool check_data(T& d, Tvec& v, int from = 0, int to = 16)
+{
+    for (int i = from; i < to; i++)
+    {
+        if (d[i] != vec_extract(v, i))
+            return false;
+    }
+    return true;
+}
+
+int main()
+{
+    unsigned char __attribute__ ((aligned (16))) rbuf[16];
+    unsigned char __attribute__ ((aligned (16))) wbuf[16];
+    __vector unsigned char a;
+
+    // 1- check aligned load and store
+    fill(rbuf);
+    a = vec_ld(0, rbuf);
+    if (!check_data(rbuf, a))
+        return 1;
+    vec_st(a, 0, wbuf);
+    if (!check_data(wbuf, a))
+        return 11;
+
+    // 2- check mixing aligned load and unaligned store
+    a = vec_ld(0, rbuf);
+    vsx_st(a, 0, wbuf);
+    if (!check_data(wbuf, a))
+        return 2;
+
+    // 3- check mixing unaligned load and aligned store
+    a = vsx_ld(0, rbuf);
+    vec_st(a, 0, wbuf);
+    if (!check_data(wbuf, a))
+        return 3;
+
+    return 0;
+}