Console-menu

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- Partial fix for using letter selection for menu items (issue 73). Menu items
can now be selected using letters rather than numbers; however, the Enter key
is still required for input to be accepted.
- Added support for Python 3.10 and 3.11.
- Dropped support for Python 3.6.

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- Partial fix for ansiwrap import when using PyInstaller (issue 66). The issue
is caused by the ansiwrap library (ansiwrap issue 6). Until ansiwrap 6 is
properly fixed, the workaround is to use a conditional import and fall back
to textwrap if ansiwrap fails to import. The drawback to this workaround is
that ANSI colored text will no longer wrap properly when using PyInstaller.

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- Add feature to allow menu text to be dynamically updated (issue 25).
- Add feature to disable the automatic screen refresh when a menu item is
selected - add "clear_screen=False" argument during Menu instantiation
(issue 23).
- Allow colors in menu item names (issue 45).
- Menu items with text longer than the menu width will now wrap and indent
properly (issue 62)
- Migrate from Travis-CI to GitHub Actions.

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- Fix issue 28, allow console screen argument for SelectionMenu.
- Fix issue 22, allow custom exit text for main menu.
- Fix issue 19, failure to clear screen using Windows 10 SSH.
- Potentially Breaking Change: reverted screen.input() method to return the
simple string value, as it did in v0.4.0 and prior. Moved the InputResult
tuple for input validation to the PromptUtils class.
- Expanding documentation and converting to Google-style docstrings (WIP).
- Add flush() method to screen.

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- Remove unnecessary imports (10).

===================
- Add new input validation feature, contributed by DaBbleR23.
- Add feature to allow menu item removal.
- Add feature to allow user to cancel input.
- Remove external readline dependency.