Add support for TOML

[ESultanik]

[ri0t]

Soo. lemme see if i got this right: Once this issue is solved, i can use graphtage to automatically update old toml-configuration file versions to up to date ones by supplying a small ruleset (i.e. patch) on whats changed? That would be lovely!

I've just implemented a crude upgrader for that purpose - but i feel, that it lacks in power/flexibility. E.g. it renames field names by search/replace... duuuhhh..