Remove always_show_hint settable

[tleonhardt]

Remove always_show_hint settable.

This setting worked well for some use cases when cmd2 was using readline. However, due to subtle differences in how prompt-toolkit and readline work, setting this True provided a bad user experience now that cmd2 is based on prompt-toolkit.

Also:

• Added more explicit documentation for the auto_suggest parameter to document how to accept a suggestion

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.49%. Comparing base (12a7d5e) to head (508898a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1652      +/-   ##
==========================================
- Coverage   99.49%   99.49%   -0.01%     
==========================================
  Files          21       21              
  Lines        4747     4741       -6     
==========================================
- Hits         4723     4717       -6     
  Misses         24       24              

Flag	Coverage Δ
unittests	99.49% <100.00%> (-0.01%)	⬇️

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