[Feature Request] `imfill` for grayscale image

[aquatiko]

I followed the discussion from: JuliaImages/Images.jl#706
Is the function already implemented somewhere in Julia or is there is a need to do so?
I would be happy to submit a PR if needed.

[juliohm]

Hi @aquatiko ,

As far as I remember, the function is not available yet. I would be happy to review your PR :)

Cheers,
-Julio

[ThomasRetornaz]

to fill generic holes #116 (comment)
to fill holes of a certain sizes (area) use area closing from maxtree for instance