MERGE - Thread safe and multi-threaded changes

[carlwilson]

• added processing and reporting classes for multi-threaded validation and reporting;
• JavaScript constructs moved from BaseValidator to dedicated JavaScriptEvaluator class; and
• tidied compiler warnings.

[codecov]

Codecov Report

Merging #960 into integration will decrease coverage by 0.93%.
The diff coverage is 0%.

@@                Coverage Diff                @@
##             integration     #960      +/-   ##
=================================================
- Coverage          27.48%   26.55%   -0.94%     
  Complexity           944      944              
=================================================
  Files                174      183       +9     
  Lines               7186     7438     +252     
  Branches            1106     1118      +12     
=================================================
  Hits                1975     1975              
- Misses              4947     5199     +252     
  Partials             264      264

Impacted Files	Coverage Δ	Complexity Δ
...apdf/pdfa/validation/validators/BaseValidator.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...org/verapdf/processor/reports/ResultStructure.java	0% <0%> (ø)	0 <0> (?)
.../multithread/MultiThreadProcessingHandlerImpl.java	0% <0%> (ø)	0 <0> (?)
...or/reports/multithread/writer/MrrReportWriter.java	0% <0%> (ø)	0 <0> (?)
...essor/reports/multithread/writer/ReportWriter.java	0% <0%> (ø)	0 <0> (?)
...s/multithread/writer/ReportParserEventHandler.java	0% <0%> (ø)	0 <0> (?)
...ts/multithread/writer/AbstractXmlReportWriter.java	0% <0%> (ø)	0 <0> (?)
...dfa/validation/validators/JavaScriptEvaluator.java	0% <0%> (ø)	0 <0> (?)
...or/reports/multithread/writer/XmlReportWriter.java	0% <0%> (ø)	0 <0> (?)
...r/reports/multithread/writer/TextReportWriter.java	0% <0%> (ø)	0 <0> (?)
... and 9 more

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