Implement TotalDownload functionality

With the recent 'multibar' interface changes TotalDownload has been disabled.
Now we have a new UI and we need to find another way to display this
information.

When 'TotalDownload' config option is enabled we are going to have an extra
progress bar at the bottom of the screen that shows how much of the entire
download has been completed.

Closes FS#68202

Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

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