True TOML config support #47

Job	Run time
test 3.13 on ubuntu-latest	2m 24s
tox env type on ubuntu-latest	51s
test 3.13 on windows-latest	2m 18s
tox env type on windows-latest	2m 0s
test 3.13 on macos-latest	2m 25s
test 3.12 on ubuntu-latest	2m 24s
test 3.12 on windows-latest	2m 20s
tox env dev on ubuntu-latest	35s
test 3.12 on macos-latest	2m 27s
tox env dev on windows-latest	1m 37s
test 3.11 on ubuntu-latest	2m 26s
tox env docs on ubuntu-latest	2m 26s
test 3.11 on windows-latest	2m 17s
tox env pkg_meta on ubuntu-latest	20s
test 3.11 on macos-latest	2m 27s
tox env pkg_meta on windows-latest	53s
test 3.10 on ubuntu-latest	2m 26s
test 3.10 on windows-latest	2m 12s
test 3.10 on macos-latest	2m 26s
test 3.9 on ubuntu-latest	1m 44s
test 3.9 on windows-latest	1m 12s
test 3.9 on macos-latest	1s
test 3.8 on ubuntu-latest	2m 23s
test 3.8 on windows-latest	1m 21s
test 3.8 on macos-latest	1m 46s
	45m 41s

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