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/test/ImgcodecsTest.swift

@@ -0,0 +1,50 @@
+//
+//  Imgcodecs.swift
+//
+//  Created by Giles Payne on 2020/02/10.
+//
+
+import XCTest
+import OpenCV
+
+class ImgcodecsTest: OpenCVTestCase {
+
+    let LENA_PATH = Bundle(for: ImgcodecsTest.self).path(forResource:"lena", ofType:"png", inDirectory:"resources")!
+
+    func testImencodeStringMatListOfByte() {
+        var buff = [UInt8]()
+        XCTAssert(Imgcodecs.imencode(ext: ".jpg", img: gray127, buf: &buff))
+        XCTAssertFalse(0 == buff.count)
+    }
+
+    func testImencodeStringMatListOfByteListOfInteger() {
+        let params40:[Int32] = [ImwriteFlags.IMWRITE_JPEG_QUALITY.rawValue, 40]
+        let params90:[Int32] = [ImwriteFlags.IMWRITE_JPEG_QUALITY.rawValue, 90]
+
+        var buff40 = [UInt8]()
+        var buff90 = [UInt8]()
+
+        XCTAssert(Imgcodecs.imencode(ext: ".jpg", img: rgbLena, buf: &buff40, params: params40))
+        XCTAssert(Imgcodecs.imencode(ext: ".jpg", img: rgbLena, buf: &buff90, params: params90))
+
+        XCTAssert(buff40.count > 0)
+        XCTAssert(buff40.count < buff90.count)
+    }
+
+    func testImreadString() {
+        dst = Imgcodecs.imread(filename: LENA_PATH)
+        XCTAssertFalse(dst.empty())
+        XCTAssertEqual(3, dst.channels())
+        XCTAssert(512 == dst.cols())
+        XCTAssert(512 == dst.rows())
+    }
+
+    func testImreadStringInt() {
+        dst = Imgcodecs.imread(filename: LENA_PATH, flags: 0)
+        XCTAssertFalse(dst.empty());
+        XCTAssertEqual(1, dst.channels());
+        XCTAssert(512 == dst.cols());
+        XCTAssert(512 == dst.rows());
+    }
+
+}