Added xoak functionality

[kthyng]

sel2d functionality is now done by xoak which is faster and better. argsel2d is no longer needed. Other changes are propagation of these changes or tests.

[codecov[bot]]

Codecov Report

Merging #56 (5f4f939) into main (8239d4f) will increase coverage by 10.50%. The diff coverage is 87.36%.

@@             Coverage Diff             @@
##             main      #56       +/-   ##
===========================================
+ Coverage   72.06%   82.56%   +10.50%     
===========================================
  Files           8       10        +2     
  Lines         562      912      +350     
===========================================
+ Hits          405      753      +348     
- Misses        157      159        +2     

Flag	Coverage Δ
unittests	82.56% <87.36%> (+10.50%)	:arrow_up:

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

Impacted Files	Coverage Δ
extract_model/accessor.py	90.74% <61.53%> (-2.71%)	:arrow_down:
extract_model/extract_model.py	75.51% <73.33%> (+3.54%)	:arrow_up:
tests/test_accessor.py	91.66% <91.66%> (ø)
extract_model/__init__.py	81.81% <100.00%> (ø)
tests/test_em.py	98.75% <100.00%> (+0.18%)	:arrow_up:
tests/test_sel2d.py	100.00% <100.00%> (ø)
tests/test_utils.py	100.00% <0.00%> (ø)
extract_model/utils.py	62.89% <0.00%> (+29.56%)	:arrow_up:

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[kthyng]

Can't figure out what is wrong with docs. Linting has to be fixed in the main branch.