Improve Detector Histogrammer: add more plots

This MR extends the DetectorHistogrammer to provide more output plots. This includes residuals with the primary MCParticle, intra-pixel quantities and some improvements to the Cluster class itself.

@kdort these are the changes we were discussing this morning

@pschutze maybe you could have a look at this since you are the maintainer of the module? You can simply click "approve" once you're happy - cool new feature! :)

@kwolters let me know if anything coding-related catches your eye.