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/LibHTML/Layout/LayoutNode.h

@@ -4,7 +4,7 @@
 #include <AK/Vector.h>
 #include <LibHTML/Layout/ComputedStyle.h>
 #include <LibHTML/TreeNode.h>
-#include <SharedGraphics/Rect.h>
+#include <LibDraw/Rect.h>
 
 class Node;
 class LayoutBlock;