GenericProject: Modernize

* Use pragma once
* Use overrides
* Clean up here and there (mostly in the headers)

Change-Id: Ib33b6a6aa1a285d281f3d8b940fe654af3941554
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/genericprojectmanager/genericprojectwizard.h

@@ -23,8 +23,7 @@
 **
 ****************************************************************************/
 
-#ifndef GENERICPROJECTWIZARD_H
-#define GENERICPROJECTWIZARD_H
+#pragma once
 
 #include <coreplugin/basefilewizard.h>
 #include <coreplugin/basefilewizardfactory.h>
@@ -72,5 +71,3 @@ protected:
 
 } // namespace Internal
 } // namespace GenericProjectManager
-
-#endif // GENERICPROJECTWIZARD_H