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Refactored histograms filling code for speed

Tomasz Bold requested to merge tbold/athena:faster-fillers into master

This MR refactors internals of HistogramFillers so that they are stateless. Also the monitored variables to filler variables matching is redone. All in all a speedup of about 30% is achieved and we have a bit simpler code. Remaining speed optimisations seem to be achievable in fill method implementation in particular fillers. tagging @fwinkl @ponyisi @cburton

Edited by Tomasz Bold

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