dh-exec is required for building the Debian package, as we use it to remap the AppImage into the right place.
On the install-time depends, add utils-linux, as we use this for finding storage devices.
- Only use saved position if the coordinates fall inside of the primary screen
Prevents problems for people with laptops that sometimes but not always use
external screens.
- Since we now set window position in C++ instead of QML, drop the
dependency on qml-module-qt-labs-settings module.
Closes#91
