Add proper readout for POKER calorimeter - MC
Add the code to read the data from POKER calorimeter (MC). This is a PbWO4-based calorimeter, with the following geometry:
- Pre-shower: Npre layers in the front, each made by Mpre crystals, with the axis aligned perpendicular to the beam axis
- Main: NxN crystals aligned in a matrix-like shape, with the axis parallel to the beam axis.
Currently, we are considering to use 20x20x200 crystals in the front, with Npre=3 or 4, and Mpre=10, and 20x20x220 crystals in the matrix, with N=9.