Cleaned up CbmTrdHitProducerQa and added it to run_qa.C.

CbmTrdHitProducerQa was previously outdated (tried to read CbmMatches from a TClonesArray in FairRoot manager) and not functioning. It now runs and properly reads digi matches from the DigiManager and produces output data in line with the conventions discussed at https://indico.gsi.de/event/13189/. The output seems to make sense (adding to it or modifying it is left for the TRD experts).

Includes all commits from !481 (merged) and !494 (merged).

Suggested reviewer: @se.gorbunov