Rename image parameter names

[haesleinhuepf]

Here I'm renaming some image parameters, where it appears crucial to me, e.g. if a parameter is a list of coordinates, it should not be called input_image.

Additionally, I added and corrected documentation in other cases.

partially addresses clEsperanto/pyclesperanto#260

[haesleinhuepf]

Hey @StRigaud I'm running out of time. So here are coming the most important image parameter renamings + documentation upgrads for other functions where it seems important.

[StRigaud]

I will have a look at the tests and see to fix it

[StRigaud]

FYI, having the label as second parameter to the statistic function is really not convenient 😞

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 41.66667% with 14 lines in your changes missing coverage. Please review.

Project coverage is 48.36%. Comparing base (a599c24) to head (745d875).

Files with missing lines	Patch %	Lines
clic/src/tier1/generate_distance_matrix.cpp	45.45%	0 Missing and 6 partials ⚠️
clic/src/tier1/multiply_matrix.cpp	50.00%	0 Missing and 2 partials ⚠️
clic/src/tier2/count_touching_neighbors.cpp	33.33%	0 Missing and 2 partials ⚠️
clic/src/tier4/centroids_of_labels.cpp	0.00%	1 Missing and 1 partial ⚠️
clic/src/tier6/voronoi_labeling.cpp	50.00%	0 Missing and 2 partials ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #378   +/-   ##
=======================================
  Coverage   48.36%   48.36%           
=======================================
  Files         243      243           
  Lines        3974     3980    +6     
  Branches     1818     1822    +4     
=======================================
+ Hits         1922     1925    +3     
  Misses        619      619           
- Partials     1433     1436    +3     

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[StRigaud]

• Prototype-compatibility pyclesperanto#273

Works locally, will integrate it with a final release before I2K hopefully