Zip Multipart fix, XZ stream fix, XZ stream support added to zip/zipx #722
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Split archives using SourceStream.cs were not moving on to the next part when a call Read() spanned 2 parts.
XZ stream support added to zip and zipx. (Which are created by WinZip)
The XZ decoder had a bug that was corrupting data sometimes without error. This was noticed when adding the unit test for WinZip27.XZ.zipx. The previous code fails with this zip (2 bytes in the middle of the exe are invalid). The fix was to re-port X86Converter() in BranchExecFilter.cs. I used a version from https://github.com/torvalds/linux/blob/master/lib/xz/xz_dec_bcj.c
I will also submit a PR that adds Zstandard to zip/zipx and 7zip. Currently this uses a 3rd party nuget package, I don't expect it to be merged, but it might serve as a reference.