Even more functionality

[StephenMachete]

New import_audio() with bugfix
Added create_new_tracks()
Added set_timeline_selection()

[codecov]

Codecov Report

Attention: Patch coverage is 61.53846% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 88.96%. Comparing base (a6145b0) to head (00da85c).
Report is 13 commits behind head on master.

❗ Current head 00da85c differs from pull request most recent head 711531c. Consider uploading reports for the commit 711531c to get more accurate results

Files	Patch %	Lines
ptsl/engine.py	23.07%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
- Coverage   89.48%   88.96%   -0.52%     
==========================================
  Files          80       82       +2     
  Lines        1398     1423      +25     
==========================================
+ Hits         1251     1266      +15     
- Misses        147      157      +10     

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[iluvcapra]

@StephenMachete Hey try running autopep8 on the files you've changed, that will take care of a lot of these lint issues. Once you've done that we can add a few unit tests so the coverage doesn't go down.

[iluvcapra]

Still some failures here, I use vim and what I usually do I I run flake8 in a vsplit buffer and just check off the errors one-by-one, it's the easiest way to hit these.

[StephenMachete]

Thanks for the patience, i think i got it now..
I installed flake8(now i know :D) and fixed all error, except the "Line too long" things.
I think its perfectly fine and readable, i don't really know how to structure it to not hit the Line too long things.
Also further fixed some code. Optional and standard value logic should be correct now(not just working :D)