When running via BepInEx, Unity's JsonUtility produces and reads empty documents.
As a bit of a hacky fix, this builds using System.Text.Json. granted, this pulls new deps in. All of the deps listed in the csproj will need to be included in the install package for BepInEx.
Reviewed-on: beerpsi/Rizu#1
Co-authored-by: Adele Reed <virepri2k@gmail.com>
Co-committed-by: Adele Reed <virepri2k@gmail.com>
