[WIP] revamped DIO calibration routine architecture

[wvlothuizen]

Changes proposed in this pull request:

• DIO timing calibration moved to instrument_drivers/library/DIO.py, drivers implement standard interface: output_dio_calibration_data() and calibrate_dio_protocol() that only involves the participation of a single instrument
• DIO mode definitions moved to instrument_drivers/library/DIO.py
• supports new seq_bar semantics for CC, old support dropped (requires compatible CC and OpenQL)

[codecov-commenter]

Codecov Report

Merging #621 into develop will increase coverage by 0.04%. The diff coverage is 56.22%.

@@             Coverage Diff             @@
##           develop     #621      +/-   ##
===========================================
+ Coverage    36.41%   36.45%   +0.04%     
===========================================
  Files          351      351              
  Lines        75642    75614      -28     
===========================================
+ Hits         27544    27566      +22     
+ Misses       48098    48048      -50     

Impacted Files	Coverage Δ
...cal_instruments/ZurichInstruments/ZI_HDAWG_core.py	44.91% <0.00%> (-1.76%)	:arrow_down:
...randomized_benchmarking/randomized_benchmarking.py	84.74% <ø> (ø)
...ent_drivers/physical_instruments/QuTech/test_CC.py	100.00% <ø> (ø)
pycqed/tests/openql/test_clifford_rb_oql.py	76.11% <0.00%> (-3.57%)	:arrow_down:
...trument_drivers/physical_instruments/QuTech_QCC.py	33.42% <26.92%> (-3.29%)	:arrow_down:
...trument_drivers/physical_instruments/QuTech_CCL.py	36.12% <29.41%> (-3.29%)	:arrow_down:
...hysical_instruments/ZurichInstruments/ZI_HDAWG8.py	40.70% <37.14%> (+9.64%)	:arrow_up:
...ment_drivers/physical_instruments/QuTech/CCCore.py	71.57% <55.55%> (-5.44%)	:arrow_down:
.../measurement/openql_experiments/clifford_rb_oql.py	54.79% <66.66%> (ø)
...truments/ZurichInstruments/UHFQuantumController.py	59.46% <67.96%> (+5.39%)	:arrow_up:
... and 12 more

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[wvlothuizen]

the changes to UHFQuantumController.py look daunting because several functions were moved. I used https://www.diff-text.com/diff-text-combined-navigation.aspx and https://compare-text-files.com/downloads.html to verify that everything is OK.