AutocompleteCombobox: Optional sorting

[masonhfisher]

A small patch for the ttkwidgets.autocomplete.AutocompleteCombobox that adds an argument to the initializer method that allows the user to decide if they want their list to be sorted automatically or not.

The option to sort automatically is set to True by default to maintain backwards compatibility with older versions of ttkwidgets.

The patch is made for the reason that sometimes you probably don't want your list to be sorted (like for example in my case, a list of months).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.68%. Comparing base (ebaa7d4) to head (19870ca).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
- Coverage   89.53%   86.68%   -2.85%     
==========================================
  Files          43       43              
  Lines        4032     4154     +122     
==========================================
- Hits         3610     3601       -9     
- Misses        422      553     +131     

Files with missing lines	Coverage Δ
ttkwidgets/autocomplete/autocompletecombobox.py	91.02% <100.00%> (+0.35%)	⬆️

... and 9 files with indirect coverage changes

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[sbordeyne]

If you could add a small test to keep coverage stable, that would be great

[sbordeyne]

Looks good to me, the coverage drop seems unrelated from looking at the more detailed codecov report