Sipm calibration routines

[theHenks]

This PR includes a SiPM calibration routine fit based on the GaussianMixtures.jl package.

• It fits a certain PE range with the mixture model and determines the PE positions including uncertainty handling based on ForwardDiff
• The sipm_simple_calibration function is adapted to have better output results
• Plot recipes for all outputs
  The recipe can be controlled with the following kwargs:
• xerrscaling: scale all errors by a factor
• show_residuals: show residual panel
• show_peaks: show peak positions in plot
• show_components: show all mixtures components

[codecov]

Codecov Report

Attention: Patch coverage is 1.65975% with 237 lines in your changes missing coverage. Please review.

Please upload report for BASE (dev@2575f47). Learn more about missing BASE report.
Report is 30 commits behind head on dev.

Files with missing lines	Patch %	Lines
ext/LegendSpecFitsRecipesBaseExt.jl	0.00%	171 Missing ⚠️
src/sipmfit.jl	0.00%	48 Missing ⚠️
src/sipm_simple_calibration.jl	0.00%	17 Missing ⚠️
src/fit_calibration.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

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  Coverage       ?   20.49%           
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  Hits           ?      651           
  Misses         ?     2526           
  Partials       ?        0           

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[fhagemann]

I was requested as reviewer.. should I still look through this or not?
Tests?