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/doc/tools/doxygen_scan.py

@@ -0,0 +1,48 @@
+import traceback
+
+class Symbol(object):
+    def __init__(self, anchor, type, cppname):
+        self.anchor = anchor
+        self.type = type
+        self.cppname = cppname
+        #if anchor == 'ga586ebfb0a7fb604b35a23d85391329be':
+        #    print(repr(self))
+        #    traceback.print_stack()
+
+    def __repr__(self):
+        return '%s:%s@%s' % (self.type, self.cppname, self.anchor)
+
+def add_to_file(files_dict, file, anchor):
+    anchors = files_dict.setdefault(file, [])
+    anchors.append(anchor)
+
+
+def scan_namespace_constants(ns, ns_name, files_dict):
+    constants = ns.findall("./member[@kind='enumvalue']")
+    for c in constants:
+        c_name = c.find("./name").text
+        name = ns_name + '::' + c_name
+        file = c.find("./anchorfile").text
+        anchor = c.find("./anchor").text
+        #print('    CONST: {} => {}#{}'.format(name, file, anchor))
+        add_to_file(files_dict, file, Symbol(anchor, "const", name))
+
+def scan_namespace_functions(ns, ns_name, files_dict):
+    functions = ns.findall("./member[@kind='function']")
+    for f in functions:
+        f_name = f.find("./name").text
+        name = ns_name + '::' + f_name
+        file = f.find("./anchorfile").text
+        anchor = f.find("./anchor").text
+        #print('    FN: {} => {}#{}'.format(name, file, anchor))
+        add_to_file(files_dict, file, Symbol(anchor, "fn", name))
+
+def scan_class_methods(c, c_name, files_dict):
+    methods = c.findall("./member[@kind='function']")
+    for m in methods:
+        m_name = m.find("./name").text
+        name = c_name + '::' + m_name
+        file = m.find("./anchorfile").text
+        anchor = m.find("./anchor").text
+        #print('    Method: {} => {}#{}'.format(name, file, anchor))
+        add_to_file(files_dict, file, Symbol(anchor, "method", name))