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/samples/dnn/face_detector/solver.prototxt

@@ -0,0 +1,28 @@
+train_net: "train.prototxt"
+test_net: "test.prototxt"
+
+test_iter: 2312
+test_interval: 5000
+test_initialization: true
+
+base_lr: 0.01
+display: 10
+lr_policy: "multistep"
+max_iter: 140000
+stepvalue: 80000
+stepvalue: 120000
+gamma: 0.1
+momentum: 0.9
+weight_decay: 0.0005
+average_loss: 500
+iter_size: 1
+type: "SGD"
+
+solver_mode: GPU
+random_seed: 0
+debug_info: false
+snapshot: 1000
+snapshot_prefix: "snapshot/res10_300x300_ssd"
+
+eval_type: "detection"
+ap_version: "11point"