Rasterization + visualization refactoring

[dokempf]

Still work in progress.

[codecov]

Codecov Report

Merging #97 (463a4d8) into main (c641f1b) will decrease coverage by 1.54%.
The diff coverage is 68.51%.

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
- Coverage   84.46%   82.92%   -1.55%     
==========================================
  Files          14       14              
  Lines        1294     1218      -76     
==========================================
- Hits         1093     1010      -83     
- Misses        201      208       +7     

Impacted Files	Coverage Δ
adaptivefiltering/pdal.py	94.50% <ø> (+0.75%)	⬆️
adaptivefiltering/utils.py	95.23% <ø> (+2.21%)	⬆️
adaptivefiltering/apps.py	31.51% <11.11%> (-1.82%)	⬇️
adaptivefiltering/segmentation.py	93.29% <68.96%> (+0.03%)	⬆️
adaptivefiltering/dataset.py	94.50% <97.36%> (+5.27%)	⬆️
adaptivefiltering/visualization.py	100.00% <100.00%> (+0.95%)	⬆️

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