One benefit from wasp-os' dirt simple drawing model is that it is very
easy for apps to provide full screen previews of themselves. Add this
for all clocks ready for us to add a watch face chooser application.
Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>
Signed-off-by: Brendan M. Sleight <bms.git@barwap.com>
[daniel@redfelineninja.org.uk: Squashed down into a single commit and
updated subject]
Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk
