Add an Info.plist for qbs-config-ui.

This will display the friendlier 'Qbs Settings' in the menu bar on OS X
instead of falling back to 'qbs-config-ui'.

Change-Id: I920073bb97030fd606431b16d742d8f137579e9c
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Remove CFBundleIconFile default Info.plist key.

This is a useless assumption; let asset catalogs or the future
icon support handle this instead.

Change-Id: I34a28ce27b5e20680a8235b67ac8a73cca036530
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>