Ability to provide file list (-n -f equivalent) via file

At the moment, the only option is to list out -n -f on as CLI parameters.

It would be great to be able to define these in a file, perhaps XML for example:

```

foo
bar

.
.
.

```

Start by locating the CLI handling for the -n and -f parameters and the Azure Blob transfer entry point. Decide how the proposed file format maps source and destination values, then verify that file-based input produces the same transfers as equivalent command-line parameters.

Written by the indexing model from the issue text.