Adding utility to generate account codes

[adamcharnock]

I need this for my current project, and figured it would be useful to others too

Simple form:

from hordak.utilities.account_codes import get_next_account_code

get_next_account_code("09")
>>> "10"

get_next_account_code("19", alpha=True)
>>> "1A"

Generator:

for code in AccountCodeGenerator(start_at='00'):
    print(code)

for code in AccountCodeGenerator(start_at='00', alpha=True):
    print(code)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.11%. Comparing base (81b90df) to head (66dbe6a).
Report is 3 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #114      +/-   ##
==========================================
+ Coverage   93.01%   93.11%   +0.10%     
==========================================
  Files          59       61       +2     
  Lines        3836     3895      +59     
  Branches      249      256       +7     
==========================================
+ Hits         3568     3627      +59     
  Misses        224      224              
  Partials       44       44              

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[adamcharnock]

Just so you're aware @PetrDlouhy