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. :^)

Kernel/Devices/BXVGADevice.h

@@ -4,7 +4,7 @@
 #include <AK/Types.h>
 #include <Kernel/Devices/BlockDevice.h>
 #include <Kernel/VM/PhysicalAddress.h>
-#include <SharedGraphics/Size.h>
+#include <LibDraw/Size.h>
 
 class BXVGADevice final : public BlockDevice {
     AK_MAKE_ETERNAL