Add Alpide sensor model
Implementation of a new sensor model for the Alpide sensor: alpide
Pixel dimensions taken from https://doi.org/10.1016/j.nima.2016.05.016 . The other dimensions (chip excesses, PCB, support) resemble typical assemblies as they are e.g. used for beam telescopes, see model e.g. mimosa26
for the EUDET-type beam telescopes.