ATLIDTRKCP-501: Decouple computation from setter for pixel cluster charge and ToT
This decouples the computation of quantities from any setter for the pixel clusters.
In a few words:
- introduced some global functions that can provide the computation of these quantities. These functions can work with a vector of elements or the cluster object itself (provided the vector of elements is already available)
- adapted the clusterization code and the cluster EDM converters
JIRA: ATLIDTRKCP-501