Napari-assistant

Bugfix
* Error when search field was empty

Bugfixes
* Dependency to napari-time-slicer was outdated leading to crashes

New features
* Undo/Redo functionality for workflows (big thanks to Cryaaa !)

Bug fixes
* Improved compatibility with dask-array backed layers
* Reduced re-execution of operations when updating parameters

New features
* The `Measurement` button is back and shows all operations that consume an image and a labels image and produce a pandas DataFrame

Bug fixes
* Some buttons showed too many operations

Removed features
* Removed button size spinner

Backwards compatibility breaking changes
* Filtering categories changed. Thus, if a specific operation cannot be found anymore, please report it by creating a [github issue](https://github.com/haesleinhuepf/napari-assistant/issues).

Bugfix:
* Some entries in the "Filter" category were duplicated from other categories.

New features
* Make search field more obvious