To add support for the new features in firmware 1.1.0, I decided to
split the Sink screen into two sections: Configuration and Power
Delivery.  The Configuration section contains all the things the Sink
screen had before, with some layout changes (notably the Save button is
part of the Configuration section, not in the HeaderBar).  The Power
Delivery section has the new features: an Output switch, which works
perfectly, and a currently half-baked Source Capabilities list item
which will eventually open a window to show the capabilities, but for
now just prints them.