added options for alignment of selection lists on setup sub-screens

This adds two new "graphicsinfo.conf" options that are a bit special:

- menu.list.SETUP[CHOOSE_OTHER].align
- menu.list.SETUP[CHOOSE_OTHER].valign

These new options can be used for horizontal and vertical alignment
of selection lists on setup sub-screens (which cannot be adjusted
individually like the other setup screens using "menu.draw_xoffset"
and "menu.draw_yoffset").

Values are as usual: "left", "center" and "right" for ".align" and
"top", "middle", "bottom" for ".valign" (with "left" and "top" being
the default values).