Switch to TOML for configuration

[vector-man]

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I believe switching the configuration file format from JSON to TOML will make it easier to tweak for users, if they need to. Official TOML library: https://github.com/toml-lang/toml .NET libraries: Tomlyn: https://github.com/xoofx/Tomlyn

Tomlet: https://github.com/SamboyCoding/Tomlet

I prefer the look of Tomlet's API out of the two.