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. :^)

Servers/WindowServer/WSAPITypes.h

@@ -1,7 +1,7 @@
 #pragma once
 
-#include <SharedGraphics/Color.h>
-#include <SharedGraphics/Rect.h>
+#include <LibDraw/Color.h>
+#include <LibDraw/Rect.h>
 
 typedef unsigned WSAPI_Color;