Switch to universal JavaApplicationStub for Mac OS X

The binary JavaApplicationStub only supports Mac JRE 6, even if you
install a later JRE from Oracle it will still run our apps with the
Mac version.

This replacement JavaApplicationStub is a shell script which comes
from here:

	https://github.com/tofi86/universalJavaApplicationStub

I've tested it with Oracle JRE 10 installed and AltosUI came up fine,
and has access to our devices and networking.

Signed-off-by: Keith Packard <keithp@keithp.com>