Refactor viewer classes to split out Qt from non-Qt part, and define Jupyter viewers #78

Job	Run time
initial_checks / Load tox environments	7s
initial_checks / codestyle (ubuntu-latest)	17s
tests / Load tox environments	9s
tests / py38-test (ubuntu-latest)	1m 25s
tests / py39-test (windows-latest)	1m 55s
tests / py310-test (ubuntu-latest)	1m 32s
tests / py311-test (windows-latest)	2m 5s
tests / py311-test-dev (ubuntu-latest)	1m 57s
tests / py38-test-pyqt63 (ubuntu-latest)	1m 58s
tests / py39-test-pyside63 (ubuntu-latest)	2m 35s
tests / py310-test-pyqt64 (ubuntu-latest)	2m 3s
tests / py311-test-dev-pyqt64 (ubuntu-latest)	2m 16s
tests / py39-test-pyside63 (macos-12)	3m 35s
tests / py310-test-pyqt64 (macos-latest)	1m 21s
tests / py311-test-dev-pyqt64 (macos-latest)	1m 37s
tests / py38-test-pyqt63 (windows-latest)	2m 35s
tests / py39-test-pyside63 (windows-latest)	2m 46s
tests / py310-test-pyqt64 (windows-latest)	2m 1s
tests / py311-test-dev-pyqt64 (windows-latest)	3m 35s
publish	0s
	35m 49s

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