[WIP] Ableton source file parsing

[louptheron]

First attempt to parse a track source file.
I started with an Ableton file (which is a gziped XML) to extract:

• plugins
• Ableton version,
• number of tracks

TODO:

• Move this to an async worker ? (it takes some time to parse the file)
• The IPFS CID seems to be the same for all .als files, dunno why...

[codecov-io]

Codecov Report

Merging #78 (4248b02) into master (5a125c1) will increase coverage by 1.74%.
The diff coverage is 51.66%.

@@            Coverage Diff            @@
##           master     #78      +/-   ##
=========================================
+ Coverage    2.55%   4.29%   +1.74%     
=========================================
  Files          22      22              
  Lines        1646    1698      +52     
=========================================
+ Hits           42      73      +31     
- Misses       1592    1609      +17     
- Partials       12      16       +4     

Flag	Coverage Δ
unittests	4.29% <51.66%> (+1.74%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/sgtm/page_new.go	0.00% <0.00%> (ø)
pkg/sgtm/processing.go	26.04% <75.75%> (+26.04%)	⬆️
pkg/sgtm/util.go	54.54% <100.00%> (+54.54%)	⬆️

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