[BREAKING] Investigate possibility of moving to System.Text.Json

[JustArchi]

Checklist

• [X] I read and understood ASF's Contributing guidelines
• [X] I also read Setting-up and FAQ, I don't need help, this is an enhancement idea
• [X] My idea doesn't duplicate existing ASF functionality described on the wiki
• [X] I believe that my idea falls into ASF's scope and should be offered as part of ASF built-in functionality
• [X] My idea doesn't violate the Steam Subscriber Agreement
• [X] My idea doesn't violate the Steam Online Conduct
• [X] This is not ASF-ui suggestion

Enhancement purpose

As a first pre-step, I've migrated ASFB to System.Text.Json a few months ago and it's working fine without any issues or drawbacks. ASF will likely need more work due to the fact that the codebase is much bigger, but it should be viable with only limited amount of missing functionalities such as Required = Required.DisallowNull.

Solution

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Why currently available solutions are not sufficient?

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Can you help us with this enhancement idea?

Yes, I can code the solution myself and send a pull request

Additional info

No response