Support compressed files in .link files

[mariodruiz]

• Include magic package to detect mime type
• Check mime type and if in shutil.get_unpack_formats() unpack file
• Update documentation

[codecov-commenter]

Codecov Report

Merging #1349 (add136a) into image_v2.8 (0cdf6b9) will decrease coverage by 0.07%. The diff coverage is 8.33%.

@@              Coverage Diff               @@
##           image_v2.8    #1349      +/-   ##
==============================================
- Coverage       46.49%   46.42%   -0.08%     
==============================================
  Files              28       28              
  Lines            4955     4963       +8     
  Branches          971      973       +2     
==============================================
  Hits             2304     2304              
- Misses           2594     2602       +8     
  Partials           57       57              

Impacted Files	Coverage Δ
pynq/utils.py	23.57% <8.33%> (-0.55%)	:arrow_down:

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