This commit is *not* a complete re-working of the scripts under package,
but is rather just enough of a re-working of the
package/osx/create_app.sh script to verify that the new Gradle build
creates a suitable fat executable jar for use in this script.
These changes have been tested with the following commands:
cd package/osx
./create_app.sh
open ../../deploy/Bisq-0.6.7.dmg
Then double-clicking the Bisq icon from the mounted DMG. Bisq starts up
as expected, without errors.
Further work will be required to update the package/osx/finalize.sh
script as well as the package/linux/ and package/windows/ scripts prior
to the next (0.7.0) release. For now, however, enough work has been done
to verify that the Gradle build creates the fat jar these scripts need.