Add progressbar to indicate library update status

[Marc]

It would be great to have a progressbar on the Serviio Console which shows the current progress of the library update.

Similar to <<issue 328>>

[Petr Nejedly]

http://forum.serviio.org/viewtopic.php?f=3&t=1129

[Petr Nejedly]

it should have:

• for adding: number of added files + file path of last added file in the last (possibly still running) cycle; this value should be cleared at the beginning of each cycle
• for updating: number of checked files / number of total files

Example:

Checking for new files: Yes Number of found files: 1223 Last found: bla.avi
Checking for file updates: Yes Progress: 1223/1560