Rework the buckettype names and data formats

[johan-bjareholt]

I have a suggestion to migrate the buckettype formats to the following:

Name: currentwindow -> os.window.current
Data format: The same

Name: afkstatus -> os.hid.activity
Data format: { activity: boolean } (previously { status: string ("afk" or "not-afk") })

We could bump up all the datastore versions for this migration, the solution would be identical to all datastores since it's just a matter of exporting the old buckets and importing them to the new ones

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[ErikBjare]

There is still work to do here in the long-term. It's now being discussed in #424.