Preserve formatting

[fdosani]

Right now edgetest doesn't preserve the formatting when it changes toml or cfg files. This would be a nice feature to get working so it doesn't butcher and preserves the existing formatting of the file.

[DreamsInCS]

Hi @fdosani! I would like to contribute to this issue. Could you make me the assignee for this?
Also, would you happen to have any repo examples handy for toml-based and cfg-based projects that I could easily test for this? Thank you so much!