Updating API

[ianhi]

Now that we're moving this from mpl-interactions we have a good opportunity to update the API. Inspired by discussions from mpl-extensions/mpl-interactions#266 here are osme initial thoughts:

Image stacks

stack_segmenter = ImageSegmenter(image_stack)

stack_segmenter.mask # returns something with the same shape as image_stack

image overlay

ImageSegmenter([img1, img2], overlay_image_stack=True)

Multiple ROIs
with an implementation inspired by this: https://github.com/ianhi/mpl-point-clicker/blob/cf254d56a5ffe7ec2cc201f67d0d326f1006694e/mpl_point_clicker/_clicker.py#L50-L53

 ImageSegmenter(image_stack, rois = ['Tumor','Kidney','Vessel'])

# alternatively
 ImageSegmenter(image_stack, rois = 3)

attn: @wgottwald

[ianhi]

Note that the rois argument is currently somewhat implemented by the nclasses argument. I think it should probably be renamed to classes an implement the behavior here.

The current_class attribute should also become a property that accepts either a string or a number

[ianhi]

A bunch of current_class improvements implemented in c2766f0

[ianhi]

do need to add docs for that though - I broke my own rule by pushing without docs :(

[wgottwald]

I am currently busy with other things but will have a look at this as soon as possible- thanks for the new repo!

[ianhi]

stacking coming in #4

[ianhi]

image stacks available in 0.2.0 and things even got documented :) https://mpl-image-segmenter.readthedocs.io/en/stable/

still no image overlay