FIX - Document catalog type checking

[carlwilson]

• added test for document catalog Type key to PdfModule;
• added MessageConstants entries for catalog type checking errors;
• unit tests and test resources for functionality.
  Closes Value for /Type in Document Catalog not validated #210

[codecov]

Codecov Report

Merging #318 into integration will increase coverage by <.01%.
The diff coverage is 58.33%.

@@                Coverage Diff                @@
##             integration     #318      +/-   ##
=================================================
+ Coverage          43.52%   43.53%   +<.01%     
- Complexity          3321     3322       +1     
=================================================
  Files                367      367              
  Lines              30148    30160      +12     
  Branches            5962     5965       +3     
=================================================
+ Hits               13122    13129       +7     
- Misses             14627    14631       +4     
- Partials            2399     2400       +1

Impacted Files	Coverage Δ	Complexity Δ
...ard/hul/ois/jhove/module/pdf/MessageConstants.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...va/edu/harvard/hul/ois/jhove/module/PdfModule.java	70.63% <58.33%> (-0.08%)	281 <0> (+1)

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[david-russo]

Empty Javadoc.