Morphological operator

[StRigaud]

Closes #385

reorganization of the dilate, erode, opening, closing operations as followed:

binary filter with pre-encoded structuring element (box and sphere) :

• binary_dilate, binary_erode -> encapsulate dilate_box, erode_box
• binary_opening, binary_closing -> reuse binary_dilate, binary_erode
• legacy with prototype: dilate_box, erode_box

grayscale filter with pre-encoded structuring element (box only) :

• grayscale_dilate, grayscale_erode -> encapsulate alias for minimum and maximum filter
• grayscale_opening, grayscale_closing -> reuse grayscale_dilate, grayscale_erode
• legacy with prototype: minimum_box, maximum_box, opening_box, closing_box

grayscale (compatible binary) with custom structuring element :

• erosion and dilation (take a custom strel parameter)
• opening and closing -> reusing erosion and dilation (take a custom strel parameter)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 42.80156% with 147 lines in your changes missing coverage. Please review.

Project coverage is 46.72%. Comparing base (60a2e87) to head (1c4204c).
Report is 20 commits behind head on master.

Files with missing lines	Patch %	Lines
clic/src/tier1/dilation.cpp	51.42%	6 Missing and 11 partials ⚠️
clic/src/tier1/erosion.cpp	51.42%	6 Missing and 11 partials ⚠️
clic/src/tier2/closing.cpp	18.75%	11 Missing and 2 partials ⚠️
clic/src/tier2/opening.cpp	18.75%	11 Missing and 2 partials ⚠️
clic/src/tier1/gradients.cpp	62.50%	0 Missing and 9 partials ⚠️
clic/src/tier1/set_ramp.cpp	57.14%	0 Missing and 9 partials ⚠️
clic/src/tier1/sum_projection.cpp	62.50%	0 Missing and 9 partials ⚠️
clic/src/tier1/laplace_filter.cpp	33.33%	2 Missing and 2 partials ⚠️
clic/src/tier1/maximum_filter.cpp	33.33%	2 Missing and 2 partials ⚠️
clic/src/tier1/mean_filter.cpp	33.33%	2 Missing and 2 partials ⚠️
... and 14 more

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #386      +/-   ##
==========================================
- Coverage   47.67%   46.72%   -0.96%     
==========================================
  Files         243      201      -42     
  Lines        4008     3829     -179     
  Branches     1835     1752      -83     
==========================================
- Hits         1911     1789     -122     
- Misses        660      682      +22     
+ Partials     1437     1358      -79     

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[StRigaud]

Let's merge this