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.cpp

@@ -8,7 +8,7 @@
 #include <LibGUI/GLayout.h>
 #include <LibGUI/GMenu.h>
 #include <LibGUI/GPainter.h>
-#include <SharedGraphics/GraphicsBitmap.h>
+#include <LibDraw/GraphicsBitmap.h>
 #include <unistd.h>
 
 GWidget::GWidget(GWidget* parent)