Refactoring

[kmvanbrunt]

Moving a bit of code around to shrink cmd2.py

• Moved cmd2 decorators into a new file called decorators.py
• Moved some constants from cmd2.py to constants.py
• Made some cmd2 module constants cmd2.Cmd class constants

[codecov]

Codecov Report

Merging #798 into master will decrease coverage by 0.02%.
The diff coverage is 96.69%.

@@            Coverage Diff             @@
##           master     #798      +/-   ##
==========================================
- Coverage   96.94%   96.91%   -0.03%     
==========================================
  Files          14       15       +1     
  Lines        3499     3506       +7     
==========================================
+ Hits         3392     3398       +6     
- Misses        107      108       +1

Impacted Files	Coverage Δ
cmd2/__init__.py	0% <0%> (ø)	⬆️
cmd2/cmd2.py	96.53% <100%> (-0.16%)	⬇️
cmd2/decorators.py	100% <100%> (ø)
cmd2/constants.py	100% <100%> (ø)	⬆️

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[tleonhardt]

cmd2.py is a huge file which predominantly contains the cmd2.Cmd class. I salute anything which moves other stuff out of there and shrinks it in size.

[tleonhardt]

If we are moving things out of cmd2.py, should we consider moving _SavedReadlineSettings to rl_utils.py and _SavedCmd2Env to utils.py?

[tleonhardt]

I wonder if it should be autofunction instead of automethod here? Or should it be automethod in the api/decorators.rst file? Or does it just not matter?