Support 80x24 terminal size.

FULL_SCREEN_HEIGHT can now be either 24 or 25 depending on TERMY.

Fixed and cleaned many related things as well.

Should be no change for 80x25 users. 80x24 should just work.

In stead of messing with the main status display, i just set it so that the "narrow" sidebar style is automatically always used for 80x24.

Asymmetric terrain_window seems to just work. I didn't do anything to it other than remove the symmetry constraint.