Add import/export functionality and buttons on ui #471

Job	Run time
ubuntu-latest, py3.9, napari repo, pip	8m 17s
ubuntu-latest, py3.9, napari repo, conda	8m 33s
ubuntu-latest, py3.10, napari repo, pip	11m 0s
ubuntu-latest, py3.10, napari repo, conda	11m 0s
ubuntu-latest, py3.11, napari repo, pip	9m 41s
ubuntu-latest, py3.11, napari repo, conda	10m 9s
windows-latest, py3.9, napari repo, pip	8m 21s
windows-latest, py3.9, napari repo, conda	18m 0s
windows-latest, py3.10, napari repo, pip	12m 35s
windows-latest, py3.10, napari repo, conda	17m 58s
macos-13, py3.9, napari repo, pip	8m 20s
macos-13, py3.9, napari repo, conda	9m 31s
macos-13, py3.10, napari repo, pip	14m 4s
macos-13, py3.10, napari repo, conda	8m 37s
macos-13, py3.11, napari repo, pip	13m 49s
macos-13, py3.11, napari repo, conda	18m 3s
deploy	1s
	3h 7m 59s

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