Registration class

[jennyfolkesson]

I turned the grid registration functions into a class for improved ease of use and readability.

[codecov-commenter]

Codecov Report

Merging #75 into master will decrease coverage by 10.72%. The diff coverage is 90.83%.

@@             Coverage Diff             @@
##           master      #75       +/-   ##
===========================================
- Coverage   55.81%   45.09%   -10.73%     
===========================================
  Files          26       18        -8     
  Lines        2105     1590      -515     
===========================================
- Hits         1175      717      -458     
+ Misses        930      873       -57     

Flag	Coverage Δ
#unittests	45.09% <90.83%> (-10.73%)	:arrow_down:

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

Impacted Files	Coverage Δ
array_analyzer/workflows/registration_workflow.py	20.68% <0.00%> (+1.54%)	:arrow_up:
array_analyzer/transform/array_generation.py	16.07% <20.00%> (ø)
array_analyzer/transform/point_registration.py	78.67% <99.04%> (+53.91%)	:arrow_up:
array_analyzer/extract/constants.py	100.00% <100.00%> (ø)
array_analyzer/utils/io_utils.py	90.27% <100.00%> (+0.13%)	:arrow_up:
tests/utils/io_utils_test.py
tests/utils/spot_regionprop_test.py
tests/extract/test_metadata.py
tests/pysero_test.py
tests/test_debug_plots.py
... and 2 more

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[jennyfolkesson]

FYI: codcov check failed because coverage has gone down compared to master, but that's only because I removed the tests directory from being counted as covered code.