Codechange: Replace Alignment enum with struct

Alignment struct contains separate horizontal and vertical alignment members.

src/smallmap_gui.cpp

@@ -1044,7 +1044,7 @@ protected:
 					y < dpi->top + dpi->height) {
 
 				/* And draw it. */
-				DrawString(x, x + legend_text_width, y, tbl.legend, TextColour::White, SA_LEFT, false, FontSize::Small);
+				DrawString(x, x + legend_text_width, y, tbl.legend, TextColour::White, AlignmentH::Start, false, FontSize::Small);
 			}
 		}
 	}