Small improvements in vpCircleHoughTransform

[rolalaro]

• Renamed the CHTParameters subclass into vpCircleHoughTransformParameters to follow ViSP naming convention
• If ViSP is compiled without OpenCV imgproc module, use expressly the vpCannyEdgeDetector class in edgeDetection in order to compute the gradients only once
• Fine tuned some parameters in the tutorial in case ViSP is compiled without OpenCV imgproc module ( NB : the detection is not perfect with the quarter disks in this case)

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.02% 🎉

Comparison is base (b0b82db) 54.34% compared to head (63902af) 54.37%.
Report is 35 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1224      +/-   ##
==========================================
+ Coverage   54.34%   54.37%   +0.02%     
==========================================
  Files         405      405              
  Lines       49822    49827       +5     
==========================================
+ Hits        27078    27093      +15     
+ Misses      22744    22734      -10     

Files Changed	Coverage Δ
modules/core/include/visp3/core/vpImageCircle.h	0.00% <ø> (ø)
...roc/include/visp3/imgproc/vpCircleHoughTransform.h	0.00% <0.00%> (ø)
modules/imgproc/src/vpCircleHoughTransform.cpp	0.00% <0.00%> (ø)

... and 7 files with indirect coverage changes

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