xz, udf support, last try

[doomedraven]

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[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@ae61c6d). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #43   +/-   ##
=========================================
  Coverage          ?   93.65%           
=========================================
  Files             ?       25           
  Lines             ?     1260           
  Branches          ?        0           
=========================================
  Hits              ?     1180           
  Misses            ?       80           
  Partials          ?        0

Impacted Files	Coverage Δ
sflock/unpack/zip7.py	93.44% <100%> (ø)

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