Implement surface annotation and improve roi preferences

[wadjih-bencheikh18]

closes : #50

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[lpatiny]

We should make the distinction between just 'show' and 'display value'. We may hide the textual value while still keeping the annotation. Those are 2 different checkboxes.

I would add one more column in front called 'Display' that would show / hide the annotation (indenpendent from the text value)

[lpatiny]

Displaying surface makes this annotation too slow. The way it is implemented being drawing thousands of little rectangle.
Please unselect the display of the surface by default.
Also by default give another color to ferret diameters.

[wadjih-bencheikh18]

I would add one more column in front called 'Display'

if display=false and displayValue=true do we show the textual values?

[lpatiny]

Yes

[lpatiny]

Should be improved in the future because surface annotation is too slow but this is another issue: #60

[lpatiny]

@stropitek This PR can be merge for me if the code is ok.
Concerning the check that fails should this be removed with the message of the merge commit ?