Clustering4D: removed unnecessary code lines + implemented position weighting with epsilon to avoid division by 0

ClusteringSpatial: removed unnecessary code lines + implemented position weighting with epsilon to avoid division by 0

EventLoaderATLASpix: corrected usage of Pixel constructor (using tot as charge as long as we don't have a calibration)

Pixel object: clean-up and removed all unnecessary and complicated member variables, also there's only 1 constructor left now

Clustering4D: removed unnecessary check for pixel->isBinary() and changed floating-point comparision to inteter comparision

EventLoaderATLASpix: removed personal comment line and rephrased that comment, also removed pixel->setCharge(tot) as that's the default in the constructor anyway

fogot to swap row/col in some places in Pixel.hpp and to save resolved merge-conflicts in ClusteringSpatial.cpp...compiles now

ClusteringSpatial: [analogue to Clustering4D] -> renamed clusterTot to clusterCharge, changed tot-weighted position calculation to charge-weighted and added if-conditions for binary pixels

Clustering4D.cpp: renamed clusterTot to clusterCharge, changed tot-weighted position calculation to charge-weighted and added if-conditions for binary pixels

AnalysisDUT.cpp: renamed all clusterToT to clusterCharge, pixelToT to pixelRawValue, corrected how they're filled  and removed useless histogram clusterTotAssocNorm

AnalysisDUT.h: renamed all clusterToT to clusterCharge, pixelToT to pixelRawValue and removed useless histogram clusterTotAssocNorm