Tests

Refactor gx.Track and gx.Multitrack (Sourcery refactored) #812

Job	Run time
cpython (3.7)	24s
cpython-lxml (3.7)	36s
cpython (3.8)	29s
cpython-lxml (3.8)	51s
cpython (3.9)	23s
cpython-lxml (3.9)	42s
cpython-lxml (3.10)	40s
cpython (3.10)	23s
cpython-lxml (3.11)	34s
cpython-lxml (3.12)	59s
cpython (3.11)	23s
cpython (3.12)	50s
static-tests (3.9)	28s
pypy (pypy-3.7)	45s
pypy (pypy-3.8)	41s
pypy (pypy-3.9)	34s
pypy (pypy-3.10)	34s
Build and publish to PyPI and TestPyPI	0s
	10m 16s

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