Allow using non-SVG icons in toolbar #442

Job	Run time
initial_checks / Load tox environments	10s
initial_checks / codestyle (ubuntu-latest)	18s
tests / Load tox environments	4s
no_coverage / Load tox environments	3s
tests / py38-test (ubuntu-latest)	1m 59s
tests / py39-test (ubuntu-latest)	1m 58s
tests / py310-test (ubuntu-latest)	2m 7s
tests / py311-test (ubuntu-latest)	2m 0s
tests / py38-test (macos-12)	2m 39s
tests / py39-test (macos-12)	2m 58s
tests / py311-test (macos-latest)	1m 29s
tests / py38-test (windows-latest)	2m 56s
tests / py39-test (windows-latest)	3m 0s
tests / py310-test (windows-latest)	3m 25s
no_coverage / py39-notebooks (windows-latest)	2m 26s
no_coverage / py38-notebooks (macos-12)	2m 38s
no_coverage / py310-notebooks (ubuntu-latest)	1m 35s
no_coverage / py311-docs (ubuntu-latest)	1m 25s
no_coverage / py39-docs (macos-12)	3m 23s
no_coverage / py38-docs (windows-latest)	2m 36s
publish / Build source and wheel distribution	3m 52s
	43m 1s

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