This patch adds the APRS menu settings to the memory description for the VX8 series of radios.  I intend on adding an APRS entry to the Settings tab, enabling users to alter the settings.

I've successfully checked the attached layout against memory images for:

VX8-DR

VX8-DE

VX8-GE

I've attached an image of my VX8-DR to http://chirp.danplanet.com/issues/821 for addition to the tests/images directory.

The settings memory layout doesn't exactly match the VX-R in chirp/tests/images/, and since I don't have VX8-R to examine I won't enable the settings menu for that model.  The APRS beacons memories for that model parse OK.

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