True TOML config support #40

Job	Run time
tox env type on ubuntu-latest	54s
tox env type on windows-latest	1m 56s
test 3.13 on ubuntu-latest	4m 19s
tox env dev on ubuntu-latest	34s
tox env dev on windows-latest	1m 48s
test 3.13 on windows-latest	6m 45s
tox env docs on ubuntu-latest	5m 41s
test 3.13 on macos-latest	4m 58s
tox env pkg_meta on ubuntu-latest	25s
test 3.12 on ubuntu-latest	4m 23s
tox env pkg_meta on windows-latest	45s
test 3.12 on windows-latest	6m 45s
test 3.12 on macos-latest	5m 11s
test 3.11 on ubuntu-latest	3m 27s
test 3.11 on windows-latest	6m 47s
test 3.11 on macos-latest	4m 14s
test 3.10 on ubuntu-latest	3m 26s
test 3.10 on windows-latest	6m 44s
test 3.10 on macos-latest	5m 24s
test 3.9 on ubuntu-latest	3m 30s
test 3.9 on windows-latest	5m 39s
test 3.9 on macos-latest	2m 28s
test 3.8 on ubuntu-latest	3m 29s
test 3.8 on windows-latest	6m 2s
test 3.8 on macos-latest	5m 11s
	1h 40m 45s

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