Move Widget & friends into LibGUI.

LibGUI/Label.cpp

@@ -0,0 +1,35 @@
+#include "Label.h"
+#include <SharedGraphics/Painter.h>
+
+Label::Label(Widget* parent)
+    : Widget(parent)
+{
+}
+
+Label::~Label()
+{
+}
+
+void Label::setText(String&& text)
+{
+    if (text == m_text)
+        return;
+    m_text = move(text);
+    update();
+}
+
+void Label::paintEvent(PaintEvent&)
+{
+    Painter painter(*this);
+    if (fillWithBackgroundColor())
+        painter.fill_rect({ 0, 0, width(), height() }, backgroundColor());
+    if (!text().is_empty())
+        painter.draw_text({ 4, 4, width(), height() }, text(), Painter::TextAlignment::TopLeft, foregroundColor());
+}
+
+void Label::mouseMoveEvent(MouseEvent& event)
+{
+    dbgprintf("Label::mouseMoveEvent: x=%d, y=%d\n", event.x(), event.y());
+    Widget::mouseMoveEvent(event);
+}
+