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/vars/EnableModeVars.cmake

@@ -0,0 +1,21 @@
+set(__OCV_MODE_VARS_DIR "${CMAKE_CURRENT_LIST_DIR}")
+
+macro(ocv_change_mode_var)
+  set(__var "${ARGV0}")
+  set(__mode "${ARGV1}")
+  set(__value "${ARGV2}")
+  if(__mode STREQUAL "MODIFIED_ACCESS" AND __value)
+    if(NOT __applied_mode_${__var})
+      include("${__OCV_MODE_VARS_DIR}/${__var}.cmake")
+      set(__applied_mode_${__var} 1)
+    else()
+      #message("Mode is already applied: ${__var}")
+    endif()
+  endif()
+endmacro()
+
+variable_watch(OPENCV_DISABLE_THREAD_SUPPORT ocv_change_mode_var)
+set(OPENCV_DISABLE_THREAD_SUPPORT "${OPENCV_DISABLE_THREAD_SUPPORT}")
+
+variable_watch(OPENCV_SEMIHOSTING ocv_change_mode_var)
+set(OPENCV_SEMIHOSTING "${OPENCV_SEMIHOSTING}")

3rdparty/opencv-4.5.4/cmake/vars/OPENCV_DISABLE_THREAD_SUPPORT.cmake

@@ -0,0 +1,28 @@
+# Force removal of code conditionally compiled with `#if
+# HAVE_PTHREAD`.
+ocv_update(HAVE_PTHREAD 0)
+
+# There components are disabled because they require
+# multi-threaded execution.
+ocv_update(WITH_PROTOBUF OFF)
+ocv_update(WITH_GSTREAMER OFF)
+ocv_update(WITH_IPP OFF)
+ocv_update(WITH_ITT OFF)
+ocv_update(WITH_OPENCL OFF)
+ocv_update(WITH_VA OFF)
+ocv_update(WITH_VA_INTEL OFF)
+
+# Disable bindings
+ocv_update(BUILD_opencv_python2 OFF)
+ocv_update(BUILD_opencv_python3 OFF)
+ocv_update(BUILD_JAVA OFF)
+ocv_update(BUILD_opencv_java OFF)
+
+# These modules require `#include
+# <[thread|mutex|condition_variable|future]>` and linkage into
+# `libpthread` to work.
+ocv_update(BUILD_opencv_objdetect OFF)
+ocv_update(BUILD_opencv_gapi OFF)
+ocv_update(BUILD_opencv_dnn OFF)
+
+set(OPJ_USE_THREAD "OFF" CACHE INTERNAL "")

3rdparty/opencv-4.5.4/cmake/vars/OPENCV_SEMIHOSTING.cmake

@@ -0,0 +1,10 @@
+set(CV_TRACE OFF)
+
+# These third parties libraries are incompatible with the semihosting
+# toolchain.
+set(WITH_JPEG OFF)
+set(WITH_OPENEXR OFF)
+set(WITH_TIFF OFF)
+
+# Turn off `libpng` for some linking issues.
+set(WITH_PNG OFF)