Currently when a user first uses the Addon Manager a dialog popup
prompts them about how FC is not liable for the code plugin authors
provide. It stores the binary response in a `readWarning` boolean
within the user.cfg file.
This commit changes the location of said boolean from
`User parameter:Plugins` to `User parameter:Addons`.
It also migrates old the old setting if available.
Co-authored-by: Benjamin Nauck <benjamin@nauck.se>
Add suggestions from @chennes
Co-authored-by: Chris Hennes <chennes@pioneerlibrarysystem.org>
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