[feat] add ui_options: padding_char & padding_fill

In some cases, it may be difficult to easily spot the area out of the buffer
(bad color scheme, small font, superimposed windows).

This patch adds two ncurses ui_options to bypass this problem:
- `ncurses_padding_char`, to configure the padding character,
- `ncurses_padding_fill`, to indicate whether to fill the padding line
  (or to display a single character).

The default config is the legacy one (a single "~").

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