Expect hash code collisions in reference cache

[nickl-]

Fixes #680 by adding the sum of char to int of the to string of a key we may mitigate pure hash code collisions.

[codecov[bot]]

Codecov Report

Merging #717 (f081612) into master (f301945) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #717   +/-   ##
=========================================
  Coverage     73.51%   73.51%           
  Complexity     2980     2980           
=========================================
  Files           108      108           
  Lines          9319     9319           
  Branches       1835     1835           
=========================================
  Hits           6851     6851           
  Misses         2114     2114           
  Partials        354      354           

Flag	Coverage Δ
unittests	73.51% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/main/java/bsh/util/ReferenceCache.java	86.00% <100.00%> (ø)

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