Refactor ImagePlot to be more adaptable #730

Job	Run time
Dask / dask ubuntu-latest py3.10 qt5.15.*	6m 22s
Usual / build (macOS-latest, 3.10, orange-released, 6.6., false) / orange-released macOS-latest py3.10 qt6.6.	1m 28s
Usual / build (macOS-latest, 3.10, orange-released, 5.15., false) / orange-released macOS-latest py3.10 qt5.15.	4m 42s
Usual / build (macOS-latest, 3.11, orange-latest, 5.15., false) / orange-latest macOS-latest py3.11 qt5.15.	5m 46s
Usual / build (macOS-latest, 3.9, orange-oldest, 5.15., false) / orange-oldest macOS-latest py3.9 qt5.15.	11m 43s
Usual / build (ubuntu-latest, 3.10, orange-released, 6.6., false) / orange-released ubuntu-latest py3.10 qt6.6.	1m 50s
Usual / build (ubuntu-latest, 3.10, orange-released, 5.15., false) / orange-released ubuntu-latest py3.10 qt5.15.	5m 10s
Usual / build (ubuntu-latest, 3.11, orange-latest, 5.15., false) / orange-latest ubuntu-latest py3.11 qt5.15.	5m 44s
Usual / build (ubuntu-latest, 3.9, orange-oldest, 5.15., false) / orange-oldest ubuntu-latest py3.9 qt5.15.	4m 11s
Usual / build (windows-latest, 3.10, orange-released, 6.6., false) / orange-released windows-latest py3.10 qt6.6.	3m 2s
Usual / build (windows-latest, 3.10, orange-released, 5.15., false) / orange-released windows-latest py3.10 qt5.15.	6m 17s
Usual / build (windows-latest, 3.11, orange-latest, 5.15., false) / orange-latest windows-latest py3.11 qt5.15.	8m 57s
Usual / build (windows-latest, 3.9, orange-oldest, 5.15., false) / orange-oldest windows-latest py3.9 qt5.15.	5m 20s
	1h 10m 32s

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