Added image integral algorithm.

[rold2007]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
• I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules 👮.
• I have provided test coverage for my change (where applicable)

Description

This pull request replaces #1536.

[codecov]

Codecov Report

Merging #1561 (39ed542) into master (33b118c) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1561      +/-   ##
==========================================
+ Coverage   83.59%   83.60%   +0.01%     
==========================================
  Files         742      743       +1     
  Lines       32877    32903      +26     
  Branches     3674     3677       +3     
==========================================
+ Hits        27483    27509      +26     
  Misses       4680     4680              
  Partials      714      714              

Flag	Coverage Δ
unittests	83.60% <100.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
...harp/Processing/Extensions/ProcessingExtensions.cs	100.00% <ø> (ø)
...g/Extensions/ProcessingExtensions.IntegralImage.cs	100.00% <100.00%> (ø)

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[JimBobSquarePants]

Lovely! Thanks for your patience with this. 👍