Implement TaggEff as SlowControl variable

[neiser]

As described in #45, this pull request implements passing tagging efficiencies as TSlowControl to the physics classes, via proper processors/variables. Using the detector interface is not working due to the intermediate buffering.

TODO:

• [ ] Test this implementation with actual physics classes in use, nothing should have changed!
• [ ] Still, running with slowcontrol-using physics classes on MC needs special handling in physics classes

Feel free to push fixes on top of the branch A2-dev/fixed-taggeff

[codecov-io]

Codecov Report

Merging #48 into master will decrease coverage by 3.23%. The diff coverage is 42.3%.

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
- Coverage   47.97%   44.73%   -3.24%     
==========================================
  Files         528      532       +4     
  Lines       28397    28440      +43     
  Branches     1101     1101              
==========================================
- Hits        13623    12723     -900     
- Misses      14280    15223     +943     
  Partials      494      494

Impacted Files	Coverage Δ
src/expconfig/detectors/Tagger.h	76.92% <ø> (+10.25%)	:arrow_up:
src/expconfig/detectors/EPT.h	100% <ø> (+9.52%)	:arrow_up:
src/analysis/slowcontrol/variables/Beam.h	100% <ø> (ø)	:arrow_up:
src/analysis/slowcontrol/variables/Beam.cc	33.33% <0%> (-44.45%)	:arrow_down:
...nalysis/physics/scratch/collicott/cross_section.cc	32.69% <0%> (-43.78%)	:arrow_down:
src/analysis/slowcontrol/SlowControlProcessors.cc	100% <100%> (ø)	:arrow_up:
src/analysis/physics/common/PhotonFlux.cc	64.38% <100%> (-25.9%)	:arrow_down:
...ysis/slowcontrol/processors/AcquScalerProcessor.cc	95.83% <100%> (+0.37%)	:arrow_up:
src/analysis/slowcontrol/SlowControlVariables.cc	100% <100%> (ø)	:arrow_up:
src/analysis/slowcontrol/processors/TaggEff.h	100% <100%> (ø)
... and 59 more

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