fix: deprecated PowInt, replaced by PowInt32

[quagmt]

Issue

• Pow 0 to 0 should be 1 or error #25

Description

• Deprecate PowInt and replace it by PowInt32(e int32) (decimal, error) to handle 0^0 and 0^(negative) correctly.
• PowInt: 0 pow any integer will return 0
• PowInt32: 0^0 = 1, 0^(negative integer) will return error

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.97%. Comparing base (a5482f2) to head (f929617).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
+ Coverage   95.89%   95.97%   +0.08%     
==========================================
  Files           5        5              
  Lines        1752     1789      +37     
==========================================
+ Hits         1680     1717      +37     
  Misses         48       48              
  Partials       24       24              

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