The snap store review team has approved auto-connecting the plugs
for OpenRocket to allow the application to access the .openrocket
and .java/.userPrefs directories on Linux without needing user
interaction.
This patch adjusts the snapcraft.yaml definition per the feedback at
https://forum.snapcraft.io/t/request-for-personal-files-for-openrocket/20579/5
This patch will also migrate the java preferences from the user's
home directory to the $SNAP_COMMON directory since write access will
not be allowed to the default preferences api.
Signed-off-by: Billy Olsen <billy.olsen@gmail.com>