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/android/tutorial-4-opencl/jni/Android.mk

@@ -0,0 +1,27 @@
+LOCAL_PATH := $(call my-dir)
+
+# add OpenCV
+include $(CLEAR_VARS)
+OPENCV_INSTALL_MODULES:=on
+ifdef OPENCV_ANDROID_SDK
+  ifneq ("","$(wildcard $(OPENCV_ANDROID_SDK)/OpenCV.mk)")
+    include ${OPENCV_ANDROID_SDK}/OpenCV.mk
+  else
+    include ${OPENCV_ANDROID_SDK}/sdk/native/jni/OpenCV.mk
+  endif
+else
+  include ../../sdk/native/jni/OpenCV.mk
+endif
+
+ifndef OPENCL_SDK
+  $(error Specify OPENCL_SDK to Android OpenCL SDK location)
+endif
+
+# add OpenCL
+LOCAL_C_INCLUDES += $(OPENCL_SDK)/include
+LOCAL_LDLIBS += -L$(OPENCL_SDK)/lib/$(TARGET_ARCH_ABI) -lOpenCL
+
+LOCAL_MODULE    := JNIpart
+LOCAL_SRC_FILES := jni.c CLprocessor.cpp
+LOCAL_LDLIBS    += -llog -lGLESv2 -lEGL
+include $(BUILD_SHARED_LIBRARY)