Rename-read/write/copy-functions

[StRigaud]

renaming of the read/write/copy function to a more readable name:

readTo -> read the gpu to the host
writeFrom -> write the gpu from the host
copyTo -> copy the gpu to the gpu

closes #323

@haesleinhuepf

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 28.94737% with 27 lines in your changes missing coverage. Please review.

Project coverage is 46.71%. Comparing base (679bd1b) to head (4bc296e).

Files	Patch %	Lines
clic/src/tier2/extend_labeling_via_voronoi.cpp	0.00%	0 Missing and 3 partials ⚠️
clic/src/tier3/maximum_position.cpp	0.00%	0 Missing and 3 partials ⚠️
clic/src/tier3/minimum_position.cpp	0.00%	0 Missing and 3 partials ⚠️
clic/src/tier3/exclude_labels.cpp	0.00%	0 Missing and 2 partials ⚠️
clic/src/tier3/exclude_labels_on_edges.cpp	0.00%	0 Missing and 2 partials ⚠️
clic/src/transform.cpp	0.00%	1 Missing and 1 partial ⚠️
clic/src/array.cpp	90.90%	0 Missing and 1 partial ⚠️
clic/src/tier1/write_values_to_positions.cpp	0.00%	0 Missing and 1 partial ⚠️
clic/src/tier2/maximum_of_all_pixels.cpp	0.00%	0 Missing and 1 partial ⚠️
clic/src/tier2/minimum_of_all_pixels.cpp	0.00%	0 Missing and 1 partial ⚠️
... and 8 more

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #324   +/-   ##
=======================================
  Coverage   46.71%   46.71%           
=======================================
  Files         235      235           
  Lines        3155     3155           
  Branches     1583     1583           
=======================================
  Hits         1474     1474           
  Misses        440      440           
  Partials     1241     1241           

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