Add import/export functionality and buttons on ui #470

Job	Run time
ubuntu-latest, py3.9, napari repo, pip	8m 31s
ubuntu-latest, py3.9, napari repo, conda	8m 44s
ubuntu-latest, py3.10, napari repo, pip	11m 4s
ubuntu-latest, py3.10, napari repo, conda	25s
ubuntu-latest, py3.11, napari repo, pip	9m 33s
ubuntu-latest, py3.11, napari repo, conda	9m 42s
windows-latest, py3.9, napari repo, pip	8m 2s
windows-latest, py3.9, napari repo, conda	14m 12s
windows-latest, py3.10, napari repo, pip	11m 55s
windows-latest, py3.10, napari repo, conda	14m 8s
macos-13, py3.9, napari repo, pip	7m 20s
macos-13, py3.9, napari repo, conda	14m 14s
macos-13, py3.10, napari repo, pip	12m 16s
macos-13, py3.10, napari repo, conda	14m 15s
macos-13, py3.11, napari repo, pip	6m 2s
macos-13, py3.11, napari repo, conda	14m 15s
deploy	1s
	2h 44m 39s

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