Add IntParticles (int32)

[joeljonsson]

• add IntParticles to allow additional functionality in the napari viewer, e.g. converting image layers to labels (Note: IntParticles are not supported in most pyapr functionality)
• add a brief quick start guide with pictures and code snippets to the readme

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e3fc6fa) 74.97% compared to head (5a0cc79) 75.24%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
+ Coverage   74.97%   75.24%   +0.26%     
==========================================
  Files          56       56              
  Lines        2442     2460      +18     
==========================================
+ Hits         1831     1851      +20     
+ Misses        611      609       -2     

Files	Coverage Δ
pyapr/data_containers/__init__.py	100.00% <ø> (ø)
pyapr/reconstruction/APRSlicer.py	97.53% <100.00%> (+2.79%)	⬆️
pyapr/tests/test_reconstruction.py	100.00% <100.00%> (ø)
pyapr/tests/test_utils.py	100.00% <100.00%> (ø)
pyapr/utils/types.py	100.00% <100.00%> (ø)

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[cheesema]

@joeljonsson looks good, what brought about the addition on the Int, I just had some questoin regarding the CI configs.

[joeljonsson]

@joeljonsson looks good, what brought about the addition on the Int, I just had some questoin regarding the CI configs.

It's basically just to allow to convert between image and labels layer in napari. It (and many other types) could be added to the processing, but with the way we handle particle types at the moment its just kind of a hassle