add possibility to use PMT channel-level properties from SIMCOND

Use channel-level properties in the digitization process (e.g. gain, threshold, SIN probability). This can be set by an option and the default behavior is not changed. Needs LHCb!2353 (merged), lhcb-conddb/DDDB!36 (merged) and lhcb-conddb/SIMCOND!75 (merged) to access the SIMCOND conditions with channel properties. Also adds an option to include SIN in the simulation, using the channel-level properties.

This MR is backward-compatible, i.e. will work with older DB tags. No difference in PID performance is expected.

Edited by Bartosz Piotr Malecki

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