Refactor listbox code

The changes are related to the selected item and the visible lines in
the scroll window viewport.

In particular, the function listbox_fix_visible_region() has been
eliminated, and functions previously only called by it have been
removed. It performed several tasks that are now elsewhere. One was
removed in an earlier commit (scroll window pad improvement). The task
of making a multi-line item visible has been moved to
listbox_item_in_view(). The task of making a caption line above a text
line visible is listbox specific (for the ap_list) and will be moved to
ui_day_sel_move(), where it is needed.

Boundary checks for the listbox selection have been moved to
listbox_fix_sel().

For future use listbox_sel_move() returns success or failure.

The function wins_scrollwin_ensure_visible() has been renamed
wins_scrollwin_in_view().

Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk>
Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>

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