New features:

• Add choice() shortcut for selecting an option amongst a list of choices (see documentation for examples).
• Add support for ANSI dim text formatting.
• Add frame=... option for prompt() and choice() shortcuts to allow for displaying a frame around the input prompt.

Fixes:

• Fix button width when non English characters are displayed.
• Implement flushing in Windows VT100 input.
• Fix signal handling for GraalPy.
• Fix handling of zero sized dimensions.