ui: basic search view

- Added a basic SearchView (+ controller and qt implementation)
- SearchView can set the active element of other views by dispatching a message.
- SearchView adjusts its text when the active element is changed by other views.
- Added wrappers for Button and EditBox that allow the usage of simple callback functions.

src/lib/component/ComponentFactory.h

@@ -23,6 +23,7 @@ public:
 
 	std::shared_ptr<Component> createCodeComponent();
 	std::shared_ptr<Component> createGraphComponent();
+	std::shared_ptr<Component> createSearchComponent();
 
 private:
 	ComponentFactory();