Fixed type3 font parsing, type1 font program parsing, ASCII85 parsing

[BezrukovM]

closes veraPDF/veraPDF-library#861
closes veraPDF/veraPDF-library#862

[codecov]

Codecov Report

Merging #348 into integration will decrease coverage by <.01%.
The diff coverage is 0%.

@@                Coverage Diff                @@
##             integration     #348      +/-   ##
=================================================
- Coverage          25.16%   25.15%   -0.01%     
  Complexity           857      857              
=================================================
  Files                233      233              
  Lines              12717    12720       +3     
  Branches            1794     1795       +1     
=================================================
  Hits                3200     3200              
- Misses              9151     9154       +3     
  Partials             366      366

Impacted Files	Coverage Δ	Complexity Δ
.../org/verapdf/pd/font/type1/Type1PrivateParser.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...in/java/org/verapdf/pd/font/type3/PDType3Font.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...java/org/verapdf/parser/NotSeekableBaseParser.java	39.21% <0%> (-0.39%)	40 <0> (ø)

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