Add support for the HW OSTC cR.
Add support for the HW OSTC cR.

The OSTC cR is new model for closed circuit (CCR) diving. Under the hood
it's identical to the OSTC 3, but with an S8 connector to interface with
an external oxygen sensor. Since the data format already supports oxygen
sensors, the OSTC cR can be added to the list of supported devices
without any further changes.

glance-/libdivecomputer,Poltsi/libdivecomputer-vms,henrik242/libdivecomputer,glance-/libdivecomputer,henrik242/libdivecomputer