RICH PMT readout time info

Introduce realistic readout time info in Boole (time of acquisition, time-over-threshold). Time-related values are global RICH parameters and are read from the DB. Then a time gate is applied on this realistic values.

Also a general cleanup of the PMT digitization algorithm is provided, so that there are no more hard-coded parameters used by the algorithm (all relavant values are read from the DB).

This MR needs updates in:

• LHCb (LHCb!2481 (merged))

and also is related to updates in (but Boole will still run without them):

• SIMCOND (lhcb-conddb/SIMCOND!75 (merged))
• DDDB (lhcb-conddb/DDDB!36 (merged)).

This MR is compatible with older DB tags. Minor impact on PID performance can be seen, due to improved implementation of the readout time window (changes are almost negligible).