Add silicon dEdx?

In principle we only need to add it to the current configuration and decide which algorithm to use and then people can try it out for their magic flavour tag models...

https://github.com/iLCSoft/MarlinReco/blob/master/Analysis/SiPID/src/SiTracker_dEdxProcessor.cc

Read Analysis/SiPID/src/SiTracker_dEdxProcessor.cc and inspect the repository's current configuration entry points. Determine which silicon dEdx algorithm should be exposed; done means the configuration includes it and people can try it with their flavour-tag models.

Written by the indexing model from the issue text.