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/LibDraw/TextElision.h

@@ -0,0 +1,6 @@
+#pragma once
+
+enum class TextElision {
+    None,
+    Right,
+};