XX-10387: Include backup file checkbox should be independent in both backup and backup to FTP option

-added new column in BakupPlan table (includeDeviceFiles boolean)
-use dart setting mechanism for database columns (created backup-db.xml)
-remove includeDeviceFiles as a generic setting
-extended Archive Providers APIs to use backup plan specific settings, not only generic
-migrate existing include-device-files value
-it is very easy now to extend backup-db.xml and backup_plan table for different specific
backup plan settings