fix(tar): read full extended headers

[piksel]

Fixes #383, but is not the most elegant solution. TarExtendedHeaderReader should probably be rewritten from scratch.

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[codecov]

Codecov Report

Merging #675 (218b219) into master (e1e1a91) will increase coverage by 0.30%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #675      +/-   ##
==========================================
+ Coverage   73.82%   74.13%   +0.30%     
==========================================
  Files          69       71       +2     
  Lines        8291     8450     +159     
==========================================
+ Hits         6121     6264     +143     
- Misses       2170     2186      +16     

Impacted Files	Coverage Δ
...arpCode.SharpZipLib/Tar/TarExtendedHeaderReader.cs	100.00% <100.00%> (ø)
src/ICSharpCode.SharpZipLib/Zip/ZipStrings.cs	48.83% <0.00%> (-20.40%)	⬇️
src/ICSharpCode.SharpZipLib/Tar/TarEntry.cs	67.79% <0.00%> (-1.50%)	⬇️
src/ICSharpCode.SharpZipLib/Zip/ZipFile.cs	77.24% <0.00%> (-0.08%)	⬇️
src/ICSharpCode.SharpZipLib/Zip/ZipEntry.cs	90.90% <0.00%> (ø)
src/ICSharpCode.SharpZipLib/Zip/ZipFormat.cs	89.54% <0.00%> (ø)
...harpCode.SharpZipLib/Encryption/ZipAESTransform.cs	89.09% <0.00%> (ø)
...rc/ICSharpCode.SharpZipLib/Core/ExactMemoryPool.cs	75.00% <0.00%> (ø)
.../ICSharpCode.SharpZipLib/Core/StringBuilderPool.cs	100.00% <0.00%> (ø)
src/ICSharpCode.SharpZipLib/Zip/ZipOutputStream.cs	87.82% <0.00%> (+0.06%)	⬆️
... and 8 more

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