Reading default config and have instrument specific pickup of reagent version

[johandahlberg]

This PR does to things:

1) It ensures that the default handlers are loaded, unless a handler with the same name has already been defined for that instrument. 2) It allows getting the reagent version to be specified on a per instrument type level. This means that to introduce new instruments one needs to actually add code, which is not optimal, but I think that for now this is the most pragmatic way of solving the problem.

@monikaBrandt Check the TODO tags for where to place the code to check if a run is rapid/highoutput.

[codecov[bot]]

Codecov Report

Merging #19 into master will decrease coverage by 0.27%. The diff coverage is 86.79%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
- Coverage   85.53%   85.26%   -0.28%     
==========================================
  Files          16       16              
  Lines         408      448      +40     
==========================================
+ Hits          349      382      +33     
- Misses         59       66       +7

Impacted Files	Coverage Δ
checkQC/app.py	83.87% <100%> (-0.98%)	:arrow_down:
checkQC/config.py	94% <100%> (+1.14%)	:arrow_up:
checkQC/run_type_recognizer.py	84% <83.33%> (-3.81%)	:arrow_down:

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