ui: removed 'Save Project' and 'Save Project As' actions

* removed save actions from menu in QtMainWindow
* removed MessageSaveProject and all Listeners
* updated project loading to ask whether old project and db file should be kept at old location
* fixed crash for missing include files
* fixed simple header search within source paths was broken

src/lib_gui/qt/window/QtMainWindow.h

@@ -117,9 +117,6 @@ public slots:
 	void refresh();
 	void forceRefresh();
 
-	void saveProject();
-	void saveAsProject();
-
 	void undo();
 	void redo();
 	void zoomIn();