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/TextAlignment.h

@@ -0,0 +1,18 @@
+#pragma once
+
+enum class TextAlignment {
+    TopLeft,
+    CenterLeft,
+    Center,
+    CenterRight
+};
+
+inline bool is_right_text_alignment(TextAlignment alignment)
+{
+    switch (alignment) {
+    case TextAlignment::CenterRight:
+        return true;
+    default:
+        return false;
+    }
+}