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/modules/videoio/cmake/detect_ximea.cmake

@@ -0,0 +1,30 @@
+if(NOT HAVE_XIMEA)
+  if(WIN32)
+    get_filename_component(regpath "[HKEY_CURRENT_USER\\Software\\XIMEA\\CamSupport\\API;Path]" ABSOLUTE)
+    if(NOT EXISTS ${regpath})
+      get_filename_component(regpath "[HKEY_LOCAL_MACHINE\\SOFTWARE\\XIMEA\\API_SoftwarePackage;Path]" ABSOLUTE)
+    endif()
+  endif()
+  if(X86_64)
+    set(lib_dir "API/x64" "API/64bit")
+    set(lib_suffix "64")
+  else()
+    set(lib_dir "API/x86" "API/32bit")
+    set(lib_suffix "32")
+  endif()
+  find_path(XIMEA_INCLUDE "xiApi.h"
+    PATHS "${XIMEA_ROOT}" ENV XIMEA_ROOT "/opt/XIMEA"
+    HINTS "${regpath}"
+    PATH_SUFFIXES "include" "API")
+  find_library(XIMEA_LIBRARY m3api xiapi${lib_suffix}
+    PATHS "${XIMEA_ROOT}" ENV XIMEA_ROOT "/opt/XIMEA"
+    HINTS "${regpath}"
+    PATH_SUFFIXES ${lib_dir})
+  if(XIMEA_INCLUDE AND XIMEA_LIBRARY)
+    set(HAVE_XIMEA TRUE)
+  endif()
+endif()
+
+if(HAVE_XIMEA)
+  ocv_add_external_target(ximea "${XIMEA_INCLUDE}" "${XIMEA_LIBRARY}" "HAVE_XIMEA")
+endif()