See https://stackoverflow.com/a/10334095/2018314 for details on sharing
resources among multiple projects in a solution.

With this commit all required changes for having the configuration in
two separate files should be completed.

Fixes #18

Refers to #2

Refers to #2

We can just derive a status change from the fact that the file system
watcher has fired, so no need to evaluate all kinds of things first.

Refers to #23

Refers to #2

Refers to #2

Refers to #2

Refers to #23

Refers to #2

Refers to #2

Sometimes the TaskDialog doesn't work but raises an exception. Until we
can reproduce and fix this issue we simply provide a fallback using the
(less user-friendly) MessageBox.

Refers to #2

This is the last missing strict requirement for the first version of a
tray app, so this commit closes #2.

Refers to #2

Let the user pick a directory, check size and let the user confirm and
eventually submit it into the incoming directory after some sanity
checks.

Refers to #2

Refers to #2

Refers to #2

Refers to #2

Refers to #2

Refers to #2, #3

Refers to #2

Refers to #2

Refers to #2, #26

NOTE: currently any update to the progress bar will also re-display the
balloon tooltip. These two things should be separated!

Refers to #2

Refers to #2