VTRX+ reg map fix
Small Fix:
SDACNT
of the v1.3 reg map had the address 0x01 instead of 0x02. 0x01 is a reserved address.
Additional:
added the reserved registers to the class Reg(IntEnum)
on both v1.2 and v1.3. This makes it easier to iterate through them and doesn't have a drawback (afaik). One can also use the address to get the register name with:
opto.<device>.<device_type>_reg_map.Reg(<address>)
Example with VTRx+ QLD v1.3:
opto.vtrx_vtrx_reg_map.Reg(3) # returns "Reg.CH1BIAS"
str(opto.vtrx_vtrx_reg_map.Reg(3))[4:] = "CH1BIAS"