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/highgui/misc/plugins/build_plugins.sh

@@ -0,0 +1,72 @@
+#!/bin/bash
+
+set -e
+
+if [ -z $1 ] ; then
+    echo "$0 <destination directory>"
+    exit 1
+fi
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+OCV="$( cd "${DIR}/../../../.." >/dev/null 2>&1 && pwd )"
+mkdir -p "${1}"  # Docker creates non-existed mounts with 'root' owner, lets ensure that dir exists under the current user to avoid "Permission denied" problem
+DST="$( cd "$1" >/dev/null 2>&1 && pwd )"
+CFG=${2:-Release}
+
+do_build()
+{
+TAG=$1
+D=$2
+F=$3
+shift 3
+docker build \
+    --build-arg http_proxy \
+    --build-arg https_proxy \
+    $@ \
+    -t $TAG \
+    -f "${D}/${F}" \
+    "${D}"
+}
+
+do_run()
+{
+TAG=$1
+shift 1
+docker run \
+    -it \
+    --rm \
+    -v "${OCV}":/opencv:ro \
+    -v "${DST}":/dst \
+    -e CFG=$CFG \
+    --user $(id -u):$(id -g) \
+    $TAG \
+    "$@"
+}
+
+build_gtk2_ubuntu()
+{
+VER=$1
+shift 1
+TAG=opencv_highgui_ubuntu_gtk2_builder:${VER}
+do_build $TAG "${DIR}/plugin_gtk" Dockerfile-ubuntu-gtk2 --build-arg VER=${VER}
+do_run $TAG /opencv/modules/highgui/misc/plugins/plugin_gtk/build.sh /dst gtk2_ubuntu${VER} ${CFG} "$@"
+
+}
+
+build_gtk3_ubuntu()
+{
+VER=$1
+shift 1
+TAG=opencv_highgui_ubuntu_gtk3_builder:${VER}
+do_build $TAG "${DIR}/plugin_gtk" Dockerfile-ubuntu-gtk3 --build-arg VER=${VER}
+do_run $TAG /opencv/modules/highgui/misc/plugins/plugin_gtk/build.sh /dst gtk3_ubuntu${VER} ${CFG} "$@"
+}
+
+echo "OpenCV: ${OCV}"
+echo "Destination: ${DST}"
+
+build_gtk2_ubuntu 16.04
+build_gtk2_ubuntu 16.04 -DOPENCV_PLUGIN_NAME=opencv_highgui_gtk2-opengl_ubuntu16.04 -DWITH_OPENGL=ON -DWITH_GTK_2_X=ON
+build_gtk2_ubuntu 18.04
+build_gtk3_ubuntu 18.04
+build_gtk3_ubuntu 20.04

3rdparty/opencv-4.5.4/modules/highgui/misc/plugins/plugin_gtk/CMakeLists.txt

@@ -0,0 +1,58 @@
+cmake_minimum_required(VERSION 3.5)
+project(opencv_highgui_gtk)
+
+get_filename_component(OpenCV_SOURCE_DIR "${CMAKE_CURRENT_LIST_DIR}/../../../../.." ABSOLUTE)
+include("${OpenCV_SOURCE_DIR}/cmake/OpenCVPluginStandalone.cmake")
+
+# scan dependencies
+set(WITH_GTK ON)
+include("${OpenCV_SOURCE_DIR}/modules/highgui/cmake/init.cmake")
+
+if(NOT HAVE_GTK)
+  message(FATAL_ERROR "GTK: NO")
+endif()
+
+ocv_warnings_disable(CMAKE_CXX_FLAGS -Wno-deprecated-declarations)
+
+set(OPENCV_PLUGIN_DEPS core imgproc imgcodecs)
+if(TARGET ocv.3rdparty.gtk3)
+  set(__deps ocv.3rdparty.gtk3)
+elseif(TARGET ocv.3rdparty.gtk2)
+  set(__deps ocv.3rdparty.gtk2)
+elseif(TARGET ocv.3rdparty.gtk)
+  set(__deps ocv.3rdparty.gtk)
+else()
+  message(FATAL_ERROR "Missing dependency target for GTK libraries")
+endif()
+ocv_create_plugin(highgui "opencv_highgui_gtk" "${__deps}" "GTK" "src/window_gtk.cpp")
+if(WITH_OPENGL)
+  if(HAVE_GTK2
+      AND TARGET ocv.3rdparty.gtkglext
+      AND TARGET ocv.3rdparty.gtk_opengl
+      AND NOT OPENCV_GTK_DISABLE_GTKGLEXT
+      AND NOT OPENCV_GTK_DISABLE_OPENGL
+  )
+    message(STATUS "OpenGL: YES")
+    target_link_libraries(${OPENCV_PLUGIN_NAME} PRIVATE
+        ocv.3rdparty.gtkglext ocv.3rdparty.gtk_opengl
+    )
+  else()
+    message(WARNING "OpenGL dependencies are not available!")
+  endif()
+endif()
+
+if(HAVE_GTK3)
+  message(STATUS "GTK3+: ver ${GTK3_VERSION}")
+elseif(HAVE_GTK3)
+  message(STATUS "GTK2+: ver ${GTK2_VERSION}")
+elseif(DEFINED GTK_VERSION)
+  message(STATUS "GTK+: ver ${GTK_VERSION}")
+else()
+  message(STATUS "GTK+: YES")
+endif()
+
+if(HAVE_GTHREAD)
+  message(STATUS "GThread : YES (ver ${GTHREAD_VERSION})")
+else()
+  message(STATUS "GThread : NO")
+endif()

3rdparty/opencv-4.5.4/modules/highgui/misc/plugins/plugin_gtk/Dockerfile-ubuntu-gtk2

@@ -0,0 +1,28 @@
+ARG VER
+FROM ubuntu:$VER
+
+RUN \
+  apt-get update && \
+  DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+    pkg-config \
+    cmake \
+    g++ \
+    ninja-build \
+  && \
+  rm -rf /var/lib/apt/lists/*
+
+RUN \
+  apt-get update && \
+  DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+    libgtk2.0-dev \
+  && \
+  rm -rf /var/lib/apt/lists/*
+
+RUN \
+  apt-get update && \
+  DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+    libgtkglext1-dev \
+  && \
+  rm -rf /var/lib/apt/lists/*
+
+WORKDIR /tmp

3rdparty/opencv-4.5.4/modules/highgui/misc/plugins/plugin_gtk/Dockerfile-ubuntu-gtk3

@@ -0,0 +1,21 @@
+ARG VER
+FROM ubuntu:$VER
+
+RUN \
+  apt-get update && \
+  DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+    pkg-config \
+    cmake \
+    g++ \
+    ninja-build \
+  && \
+  rm -rf /var/lib/apt/lists/*
+
+RUN \
+  apt-get update && \
+  DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+    libgtk-3-dev \
+  && \
+  rm -rf /var/lib/apt/lists/*
+
+WORKDIR /tmp

3rdparty/opencv-4.5.4/modules/highgui/misc/plugins/plugin_gtk/build.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -e
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
+OPENCV_PLUGIN_DESTINATION=$1
+OPENCV_PLUGIN_NAME=opencv_highgui_$2
+CMAKE_BUILD_TYPE=${3:-Release}
+
+shift 3 || true
+
+set -x
+cmake -GNinja \
+    -DOPENCV_PLUGIN_NAME=${OPENCV_PLUGIN_NAME} \
+    -DOPENCV_PLUGIN_DESTINATION=${OPENCV_PLUGIN_DESTINATION} \
+    -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} \
+    "$@" \
+    $DIR
+
+ninja -v