ui: diverse improvements before release

* hide build file content
* use small buttons in all windows
* new design for start screen
* fixed design for enter license ui
* added spacing to summary
* brighter icons in wizzard
* added template icon for graph
* smoothing for graph icons
* switched error icon to dot
* fixed error message tooltip immediatly disappearing
* menu item for opening documentation

src/lib_gui/qt/element/QtCodeArea.cpp

@@ -496,10 +496,10 @@ void QtCodeArea::mouseMoveEvent(QMouseEvent* event)
 		}
 	}
 
-	QToolTip::hideText();
-
 	if (!same)
 	{
+		QToolTip::hideText();
+
 		setHoveredAnnotations(annotations);
 
 		const std::vector<std::string>& errorMessages = m_fileWidget->getErrorMessages();