napari native button for snap, setting exposure time

[pskeshu]

https://docs.google.com/presentation/d/1xhYy63J3l_RVmNL03mO-KZ08yPn7R3R6ueBdStsPcTY/edit#slide=id.gba8fab3079_0_112

This interface can use a snap button, instead of relying on a separate magicgui.

[pskeshu]

For code examples, https://github.com/quantumjot/arboretum
https://napari.org/tutorials/applications/cell_tracking

[pskeshu]

@theblackfly @ndsystems/tech-core you might also be interested in this.

[pskeshu]

https://github.com/KristinaUlicna/arboretum/blob/738454fcc32d044a6cefec48e0bea4d7ea23aee8/arboretum/core.py#L314

So, essentially one creates a napari.Viewer() and passes it as an argument to a plugin-builder at the highest level.

[pskeshu]

https://github.com/KristinaUlicna/arboretum/blob/738454fcc32d044a6cefec48e0bea4d7ea23aee8/arboretum/core.py#L100

The plugin itself is at https://github.com/KristinaUlicna/arboretum/blob/738454fcc32d044a6cefec48e0bea4d7ea23aee8/arboretum/plugin.py#L63, which is nothing but an instance of QWidget from qtpy