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/view/SearchView.h

@@ -0,0 +1,22 @@
+#ifndef SEARCH_VIEW_H
+#define SEARCH_VIEW_H
+
+#include "component/view/View.h"
+
+class SearchController;
+
+class SearchView : public View
+{
+public:
+	SearchView(ViewLayout* viewLayout);
+	virtual ~SearchView();
+
+	virtual std::string getName() const;
+
+	virtual void setText(const std::string& s) const = 0;
+
+protected:
+	SearchController* getController();
+};
+
+#endif // SEARCH_VIEW_H