contrib/bsddialog: Import version 0.3

New features overview:

• Unicode. User interface handles multi-column characters. API can handle char* like a multibyte character string. Internally wide characters are used for keyboard input, to adapt word wrapping and dynamic text auto-sizing for multi-column characters.
• Forms refactoring. Complete rewrite deleting libformw dependency.
• Theme. New utility options to save and load custom theme at run-time.
• TUI navigation. Added keys to navigate input components. Changed default focus behavior of input dialogs to be LGPL-dialog-like; a new option can set the previous whiptail-like behavior.

See /usr/src/contrib/bsddialog/CHANGELOG '2022-08-29 Version 0.3'
for more detailed information.

Merge commit '2c9fd7655ba54e7239f528e1af9fe09662de9b03'