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/imgcodecs/src/grfmt_base.cpp

@@ -0,0 +1,156 @@
+/*M///////////////////////////////////////////////////////////////////////////////////////
+//
+//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
+//
+//  By downloading, copying, installing or using the software you agree to this license.
+//  If you do not agree to this license, do not download, install,
+//  copy or use the software.
+//
+//
+//                        Intel License Agreement
+//                For Open Source Computer Vision Library
+//
+// Copyright (C) 2000, Intel Corporation, all rights reserved.
+// Third party copyrights are property of their respective owners.
+//
+// Redistribution and use in source and binary forms, with or without modification,
+// are permitted provided that the following conditions are met:
+//
+//   * Redistribution's of source code must retain the above copyright notice,
+//     this list of conditions and the following disclaimer.
+//
+//   * Redistribution's in binary form must reproduce the above copyright notice,
+//     this list of conditions and the following disclaimer in the documentation
+//     and/or other materials provided with the distribution.
+//
+//   * The name of Intel Corporation may not be used to endorse or promote products
+//     derived from this software without specific prior written permission.
+//
+// This software is provided by the copyright holders and contributors "as is" and
+// any express or implied warranties, including, but not limited to, the implied
+// warranties of merchantability and fitness for a particular purpose are disclaimed.
+// In no event shall the Intel Corporation or contributors be liable for any direct,
+// indirect, incidental, special, exemplary, or consequential damages
+// (including, but not limited to, procurement of substitute goods or services;
+// loss of use, data, or profits; or business interruption) however caused
+// and on any theory of liability, whether in contract, strict liability,
+// or tort (including negligence or otherwise) arising in any way out of
+// the use of this software, even if advised of the possibility of such damage.
+//
+//M*/
+
+#include "precomp.hpp"
+
+#include "grfmt_base.hpp"
+#include "bitstrm.hpp"
+
+namespace cv
+{
+
+BaseImageDecoder::BaseImageDecoder()
+{
+    m_width = m_height = 0;
+    m_type = -1;
+    m_buf_supported = false;
+    m_scale_denom = 1;
+}
+
+
+ExifEntry_t BaseImageDecoder::getExifTag(const ExifTagName tag) const
+{
+    return m_exif.getTag(tag);
+}
+bool BaseImageDecoder::setSource( const String& filename )
+{
+    m_filename = filename;
+    m_buf.release();
+    return true;
+}
+
+bool BaseImageDecoder::setSource( const Mat& buf )
+{
+    if( !m_buf_supported )
+        return false;
+    m_filename = String();
+    m_buf = buf;
+    return true;
+}
+
+size_t BaseImageDecoder::signatureLength() const
+{
+    return m_signature.size();
+}
+
+bool BaseImageDecoder::checkSignature( const String& signature ) const
+{
+    size_t len = signatureLength();
+    return signature.size() >= len && memcmp( signature.c_str(), m_signature.c_str(), len ) == 0;
+}
+
+int BaseImageDecoder::setScale( const int& scale_denom )
+{
+    int temp = m_scale_denom;
+    m_scale_denom = scale_denom;
+    return temp;
+}
+
+ImageDecoder BaseImageDecoder::newDecoder() const
+{
+    return ImageDecoder();
+}
+
+BaseImageEncoder::BaseImageEncoder()
+{
+    m_buf = 0;
+    m_buf_supported = false;
+}
+
+bool  BaseImageEncoder::isFormatSupported( int depth ) const
+{
+    return depth == CV_8U;
+}
+
+String BaseImageEncoder::getDescription() const
+{
+    return m_description;
+}
+
+bool BaseImageEncoder::setDestination( const String& filename )
+{
+    m_filename = filename;
+    m_buf = 0;
+    return true;
+}
+
+bool BaseImageEncoder::setDestination( std::vector<uchar>& buf )
+{
+    if( !m_buf_supported )
+        return false;
+    m_buf = &buf;
+    m_buf->clear();
+    m_filename = String();
+    return true;
+}
+
+bool BaseImageEncoder::writemulti(const std::vector<Mat>&, const std::vector<int>& )
+{
+    return false;
+}
+
+ImageEncoder BaseImageEncoder::newEncoder() const
+{
+    return ImageEncoder();
+}
+
+void BaseImageEncoder::throwOnEror() const
+{
+    if(!m_last_error.empty())
+    {
+        String msg = "Raw image encoder error: " + m_last_error;
+        CV_Error( Error::BadImageSize, msg.c_str() );
+    }
+}
+
+}
+
+/* End of file. */