base36 uuids

Now uses base36 everywhere it was previously using base16.
The best name we could come up with for this was 'Alphadecimal',
so the getter is UUID::getAlphadecimal()

(cherry picked from commit 9f2b11408a9d62e9cce3abe82ea560915cf890af)

Change-Id: I01995b22b22f7e22f2197b2f74e1188c1c701e02