C++: Add tool button in editor for "Analyze File"

Adds a button for analyze file to all text editors that have a C++
source file open.

Task-number: QTCREATORBUG-23348
Change-Id: If08f2969304ee0817f00c9ee5ff8c0d4f96f7f72
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/clangtools/clangtoolsplugin.h

@@ -45,6 +45,8 @@ public:
 
 private:
     bool initialize(const QStringList &arguments, QString *errorString) final;
+    void registerAnalyzeActions();
+
     QVector<QObject *> createTestObjects() const final;
 
     class ClangToolsPluginPrivate *d = nullptr;