[hydra] Add AutoEnableHemisphereTracking

The Razer Hydra requires the user to point each controller at the base
station while this method called to enable proper tracking below the
hydra base station.

See documentation of `sixenseAutoEnableHemisphereTracking` for more
information.

A script initialization would be something like
```
if starting:
	diagnostics.debug("Please point both Hydra controllers at the base and press either trigger")
	initializing = True
if initializing:
	if True in [e.trigger == 1 for e in hydra]:
		for e in hydra: e.enableHemisphereTracking()
		initializing = False
		diagnostics.debug("Hydra initialized")
else:
	pass
```