Tests

Refactor and improve LabelBook and FlatImageBook #57

Job	Run time
Test with Python 3.8 on Windows	1m 30s
Test with Python 3.8 and wxPython 4.1.1	45m 8s
Test with Python 3.9 on Windows	1m 32s
Test with Python 3.8 and wxPython 4.2.1	46m 18s
Test with Python 3.10 on Windows	1m 29s
Test with Python 3.8 and wxPython 4.2.2	23m 41s
Test with Python 3.11 on Windows	1m 13s
Test with Python 3.9 and wxPython 4.1.1	44m 18s
Test with Python 3.9 and wxPython 4.2.1	46m 18s
Test with Python 3.9 and wxPython 4.2.2	24m 6s
Test with Python 3.10 and wxPython 4.1.1	44m 38s
Test with Python 3.10 and wxPython 4.2.1	46m 0s
Test with Python 3.10 and wxPython 4.2.2	23m 55s
Test with Python 3.11 and wxPython 4.2.1	45m 19s
Test with Python 3.11 and wxPython 4.2.2	23m 26s
Test with Python 3.12 and wxPython 4.2.2	23m 21s
Test with Python 3.13 and wxPython 4.2.2	23m 18s
	7h 45m 30s

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