Pre-submission cleanup via field attributes

[rimutaka]

At the moment there is a function that removes or hashes some potentially sensitive info in reports just before submitting them to INBOX. This is a bit risky because changes to the report struct need to be reflected there. There is a chance that some fields will be missed.

A better solution would be to annotate Report and Tech members with a custom attribute like #[private] and then clean them up using a macro.