Detect unsafe EntityResolver usage

[marcelel]

Ref #628

[codecov]

Codecov Report

Merging #631 (3b06058) into master (fa7f7c4) will increase coverage by 0.04%.
The diff coverage is 87.23%.

@@             Coverage Diff              @@
##             master     #631      +/-   ##
============================================
+ Coverage     84.90%   84.95%   +0.04%     
- Complexity     1873     1908      +35     
============================================
  Files           154      155       +1     
  Lines          5036     5130      +94     
  Branches       1124     1133       +9     
============================================
+ Hits           4276     4358      +82     
- Misses          339      348       +9     
- Partials        421      424       +3     

Impacted Files	Coverage Δ	Complexity Δ
...secbugs/xml/EntityResolverUnsafeUsageDetector.java	87.23% <87.23%> (ø)	35.00 <35.00> (?)

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