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/misc/objc/macosx/Mat+Converters.h

@@ -0,0 +1,32 @@
+//
+//  Mat+Converters.h
+//
+//  Created by Masaya Tsuruta on 2020/10/08.
+//
+
+#pragma once
+
+#ifdef __cplusplus
+#import "opencv2/core.hpp"
+#else
+#define CV_EXPORTS
+#endif
+
+#import "Mat.h"
+#import <Foundation/Foundation.h>
+#import <AppKit/AppKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+CV_EXPORTS @interface Mat (Converters)
+
+-(CGImageRef)toCGImage CF_RETURNS_RETAINED;
+-(instancetype)initWithCGImage:(CGImageRef)image;
+-(instancetype)initWithCGImage:(CGImageRef)image alphaExist:(BOOL)alphaExist;
+-(NSImage*)toNSImage;
+-(instancetype)initWithNSImage:(NSImage*)image;
+-(instancetype)initWithNSImage:(NSImage*)image alphaExist:(BOOL)alphaExist;
+
+@end
+
+NS_ASSUME_NONNULL_END