Adding "Save path" column

### Problem

When changing "Save path" for all torrents with the same "Save path"

* it's helpful to select all torrents that has that path as "Save path" (so that one "Set location" operation move multiple torrents)
* without a "Save path" column the torrent path is read from the "General" tab which show the "Save path" for one torrent at a time which is less efficient

### Solution

Add a "Save path" column in the "Transfers" tab