Vcs: Use PagedSettings for all plugin settings

Hopefully the last structural change for a while.

Settings lifetime is again tied to the plugin private.

Change-Id: I221e8b8baa69422306191b48a9f034ef5b1a0dc2
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/cvs/cvsplugin.cpp

@@ -288,6 +288,7 @@ private:
     bool commit(const QString &messageFile, const QStringList &subVersionFileList);
     void cleanCommitMessageFile();
 
+    CvsSettings m_setting;
     CvsClient *m_client = nullptr;
 
     QString m_commitMessageFileName;
@@ -320,8 +321,6 @@ private:
 
     QAction *m_menuAction = nullptr;
 
-    CvsSettingsPage m_settingsPage;
-
 public:
     VcsSubmitEditorFactory submitEditorFactory {
         submitParameters,