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.cpp

@@ -0,0 +1,22 @@
+#include "component/view/SearchView.h"
+
+#include "component/controller/SearchController.h"
+
+SearchView::SearchView(ViewLayout* viewLayout)
+	: View(viewLayout, Vec2i(100, 100))
+{
+}
+
+SearchView::~SearchView()
+{
+}
+
+std::string SearchView::getName() const
+{
+	return "SearchView";
+}
+
+SearchController* SearchView::getController()
+{
+	return View::getController<SearchController>();
+}