True TOML config support #39

Job	Run time
test 3.13 on ubuntu-latest	4m 15s
test 3.13 on windows-latest	16m 31s
test 3.13 on macos-latest	4m 48s
tox env type on ubuntu-latest	56s
test 3.12 on ubuntu-latest	4m 24s
tox env type on windows-latest	2m 16s
test 3.12 on windows-latest	14m 17s
tox env dev on ubuntu-latest	39s
test 3.12 on macos-latest	5m 3s
tox env dev on windows-latest	1m 53s
test 3.11 on ubuntu-latest	3m 16s
tox env docs on ubuntu-latest	5m 42s
test 3.11 on windows-latest	11m 27s
tox env pkg_meta on ubuntu-latest	21s
test 3.11 on macos-latest	4m 6s
tox env pkg_meta on windows-latest	56s
test 3.10 on ubuntu-latest	3m 24s
test 3.10 on windows-latest	10m 50s
test 3.10 on macos-latest	4m 6s
test 3.9 on ubuntu-latest	9s
test 3.9 on windows-latest	24s
test 3.9 on macos-latest	13s
test 3.8 on ubuntu-latest	10s
test 3.8 on windows-latest	30s
test 3.8 on macos-latest	14s
	1h 40m 50s

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