[Distutils] toml

[Daniel Holth]

Learned about toml the other day, looks like it could be useful for
packaging. It is an .ini-style language that maps unambiguously to a
dict, supports comments, and is used by rust's packaging system
"cargo". https://github.com/toml-lang/toml

Unfortunately at least 3 of the Python implementations don't seem to
be up to date with the current version of the spec specifically
regarding triple-""" strings.