Make the responder more compliant with the OLA RDM Tests.

See here for more info, in an ideal world they should all pass, I've improved a few bits, but I'm not really an Arduino guru:
http://www.openlighting.org/rdm-tools/rdm-responder-tests/

Particularly SUPPORTED_PARAMETERS doesn't return the right values for the additionalCommands PIDs, I'm guessing due to some sort of pointer issue (I think it's also double big/little endian flipping them, but the numbers are currently entirely wrong).

Have a play with the tests if you've got access to a suitable dongle, they're pretty user friendly.

This is my first commit using TortoiseGit, so apologies if I've screwed all the line endings; let me know and I'll change the setting that should fix that.