LibDraw: Introduce (formerly known as SharedGraphics.)

Instead of LibGUI and WindowServer building their own copies of the drawing
and graphics code, let's it in a separate LibDraw library.

This avoids building the code twice, and will encourage better separation
of concerns. :^)

Libraries/LibGUI/GWidget.h

@@ -7,9 +7,9 @@
 #include <LibCore/CObject.h>
 #include <LibGUI/GEvent.h>
 #include <LibGUI/GShortcut.h>
-#include <SharedGraphics/Color.h>
-#include <SharedGraphics/Font.h>
-#include <SharedGraphics/Rect.h>
+#include <LibDraw/Color.h>
+#include <LibDraw/Font.h>
+#include <LibDraw/Rect.h>
 
 class GraphicsBitmap;
 class GAction;