Stackview

New features
* Added support for `colormap`s (thanks to marabuuu and others for proposing) containing some code from [microfilm](https://github.com/guiwitz/microfilm).
* Added support for `display_min/_max`
* Added `toggleable` to `switch` so that multiple images can be shown at the same time

Bugfixes
* `annotate()` didn't show updates when annotating 2D images


Bugfixes
* interact wasn't executing the function after setting up the GUI

Changes potentially breaking backwards compatibility
* continuous_update parameter of all `stackview` functions is now True per default

**Full Changelog**: https://github.com/haesleinhuepf/stackview/compare/0.5.2...0.6.0

New features
* Added `switch` to switch between images


New features
* `crop` widget (thanks to paxcalpt for proposing)


https://user-images.githubusercontent.com/12660498/213865928-affb6cdc-ab58-4b19-9543-7ef5525a9b2b.mp4

Backwards compatibility breaking bug fixes
* The visualisation of label images was changed: The first two colors were flipped (now new: 1=cyan, 2=orange). The colour order is now identical with matplotlib default colours.
* The `insight()` function displayed images with < 100 pixels as string. It now uses the plot view with min/max and histogram stats

Bug fixes
* Rectangular images were not shown properly
* Switching from 2D to 3D images in `interact` caused an error.

New features
* `assist` offers an `operation` pulldown and shows `interact` for the selected operation

Backwards compatibility breaking changes / deprecations / obsolete functionality
* Internal refactoring may break backwards compatibility in case `_private` members were used.
* Parameters `display_width` and `display_height` are now without function. These parameters will be removed in the 0.5.0 future release. Use `zoom_factor` instead.

Other backwards compatibiltiy breaking changes are not intentional. Get in touch and create a github issue in case of any problems.

**Full Changelog**: https://github.com/haesleinhuepf/stackview/compare/0.3.10...0.4.0