The 'uni-t-dmm' driver/directory will not appear as a "driver" to
frontends anymore, it's just an internal thing.
The frontends will see a uni-t-ut61d and voltcraft-vc820 driver now,
with the correct names and parsers etc. attached to them.
This is not fully finished yet, but it's a start (and works mostly):
$ sigrok-cli -D
The following devices were found:
UNI-T UT61D with 1 probe: P1
Voltcraft VC-820 with 1 probe: P1
$ sigrok-cli --driver voltcraft-vc820 -D
The following devices were found:
Voltcraft VC-820 with 1 probe: P1
$ sigrok-cli --driver uni-t-ut61d -D
The following devices were found:
UNI-T UT61D with 1 probe: P1
# Now attaching a UNI-T UT61D device via USB.
$ sigrok-cli --driver uni-t-ut61d --samples 3 -O analog
P1: -0.017800 V DC
P1: -0.017600 V DC
P1: -0.017700 V DC
# Now attaching a Voltcraft VC-820 device via USB instead.
$ sigrok-cli --driver voltcraft-vc820 --samples 3 -O analog
P1: -0.319200 V DC
P1: -0.319300 V DC
P1: -0.319300 V DC
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