Stacked standard curves

[nizwant]

I tried to implement it as closely as possible to the one Michael sent us:

Our version:

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 61 lines in your changes missing coverage. Please review.

Project coverage is 85.17%. Comparing base (260ecd4) to head (f164608).

Files with missing lines	Patch %	Lines
R/plots-standard_curve.R	0.00%	61 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #212      +/-   ##
==========================================
- Coverage   88.20%   85.17%   -3.04%     
==========================================
  Files          14       14              
  Lines        1713     1774      +61     
==========================================
  Hits         1511     1511              
- Misses        202      263      +61     

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[nizwant]

There are two color version of this plot: monochromatic and polychromatic. The first one shows trend in time - the bluer line the more recent it is, I think it will be useful to show change of calibration of devideces in time, the other one uses broader color space and is useful to distinct failed experiments (on Michael plots we can see that orange and pink do not fit as good as the others)

[nizwant]

Dependency for this PR is #208