Update Scifi electronics response for pacific5

SciFi electronics response is updated for pacific5 which is made default. This requires also change is effective noise simulation (Jira task LHCBSCIFI-150). Until this is done, effective is turned off. This increases the digitization time for the moment.

Since different pacific version have different calibrations, a default calibration setting is added.

Pacific5 electronic response is less flat, a gain factor is added to mimic the calibration in electronics.

Pacific4 tshift setting is updated to reduce the effect of non-uniform efficiency.

More details can be found at https://indico.cern.ch/event/925703/contributions/3898641/attachments/2052989/3441604/scifi-general-08062020.pdf

FYI: @lohenry @emgabrie @dunverza

Test with !300 (merged) (reference update)