Muon efficiency correction feature updates

Merged Johannes Junggeburth requested to merge (removed):MCP_EffiRecommendations into 21.2

Hi everybody,

this MR is going to prepare the next round of recommendations for the reconstruction, TTVA and isolation scale-factors. The tool will be augmented with the following features

   *** Break down of the systematics per source (I.e. truth-closure/ fit-template/ isolation WP/ etc.
   *** Decorrelation of the systematics per bin as it's already done for the statistical error if it's possible 
   *** Cleaning up depreciated classes
   *** Minimize the number histograms to be loaded in the memory.  



Adding: @goblirsc, @fsforza, @szambito and our well admired friend the @atlasbot


Edited by Johannes Junggeburth

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