Add a simple example to demonstrate the colors available in cmd2.Color

[tleonhardt]

Add a simple example to demonstrate the colors available in cmd2.Color

This example actually surfaces what I consider to be a bug/edge-case in how the output methods are handling styling when soft_wrap is None or True.

Run the example and then run the taste_the_rainbow command with no arguments. All is good.

Then run the example and run taste_the_rainbow -b. That doesn't look right. Actually I changed it to set soft_wrap=False so it looks right, but before that it looked wrong.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.75%. Comparing base (cab433d) to head (0aad810).
⚠️ Report is 85 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1482      +/-   ##
==========================================
- Coverage   98.77%   98.75%   -0.03%     
==========================================
  Files          23       23              
  Lines        4884     4884              
==========================================
- Hits         4824     4823       -1     
- Misses         60       61       +1     

Flag	Coverage Δ
unittests	98.75% <ø> (-0.03%)	⬇️

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