A small code restructuring
We should not include PC9,10 in range because the current code does not support ganged wires.
Introduced WireCellId and use it in the hit struct.
Convert TDCHitWP to a class with consistent use of accessors.
Create a dedicated set of histograms to study electron/proton separation via TDC hit info
Add median TDC width to the classifier histos.
Add per-plane mean and median to the generic TDC width distributions.
Tweak settings for some histograms.