Migrate to cmake and refine the code structure (#92)

* migrate to cmake

* move the 3rd party libs

* organize 3rdparty

* update the 3rd party version

* refine the CMakeLists.txt

* update install command

* update install command

* update install command

* update install command

* update dependency

* update the dependency

* update the dependency

* remove CPM.cmake

* remove QtCreator project file

* update cmake file

* improve cmake file

* add cmakew

* use wget

* remove echo

* update the doc

* remove the screenshot

* update the doc

* update the install steps

* check the openconnect version

* update the doc

* update install scripts

* fix install scripts

* improve message

* improve message

* improve install scripts

* improve the version check

* improve the version check

* improve install script

* add version

* organize includes

* add version bump

* update CI

* update CI

* add the release flag

* update message

.vscode/settings.json

@@ -0,0 +1,23 @@
+{
+    "files.associations": {
+        "qregularexpression": "cpp",
+        "qfileinfo": "cpp",
+        "qregularexpressionmatch": "cpp",
+        "qdatetime": "cpp",
+        "qprocess": "cpp",
+        "qobject": "cpp",
+        "qstandardpaths": "cpp",
+        "qmainwindow": "cpp",
+        "qsystemtrayicon": "cpp",
+        "qpushbutton": "cpp",
+        "qmenu": "cpp",
+        "qjsondocument": "cpp",
+        "qnetworkaccessmanager": "cpp",
+        "qwebengineview": "cpp",
+        "qprocessenvironment": "cpp",
+        "qnetworkreply": "cpp",
+        "qicon": "cpp",
+        "qsslsocket": "cpp",
+        "qapplication": "cpp"
+    }
+}