ui: Revised project setup

* changed help texts
* use help buttons instead of descriptions in dialogs
* fixed show files button not up-to-date with directory list box
* fixed source file extensions shown in cdb setup
* refactored size and content setting for project content classes

src/lib_gui/qt/window/project_wizzard/QtProjectWizzard.h

@@ -74,7 +74,6 @@ private slots:
 
 	void emptyProjectCDB();
 	void headerPathsCDB();
-	void headerPathsCDBDone();
 
 	void sourcePathsJava();