CMake: Semi-automatic cleanups

* Shorten header guards
* Use override and auto where possible
* Remove useless destructors, etc.
* Remove private slots sections, unify private: sections
* Use member initialization where it makes sense

Change-Id: I00eaf6d706adc16859176d1b68c631d3336bb39f
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>

src/plugins/cmakeprojectmanager/cmakeproject.cpp

@@ -501,7 +501,7 @@ ProjectExplorer::FolderNode *CMakeProject::findOrCreateFolder(CMakeProjectNode *
         }
         if (!found) {
             // No FolderNode yet, so create it
-            ProjectExplorer::FolderNode *tmp = new ProjectExplorer::FolderNode(path);
+            auto tmp = new ProjectExplorer::FolderNode(path);
             tmp->setDisplayName(part);
             parent->addFolderNodes(QList<ProjectExplorer::FolderNode *>() << tmp);
             parent = tmp;