Notification flags

[pilot51]

Add log details and option to ignore notifications based on Notification.flags.

Each flag setting should be 3-way (ignore with flag, ignore without flag, or unset).

This will help with controlling the types of notifications that are spoken, such as ongoing notifications that keep updating and can be more annoying than helpful when spoken.

Until this feature is implemented, the likely best workaround for such notifications is to use either App List or Ignore Text to prevent the problem notifications from being spoken.