RatesAnalysis+TrigDecisionTool: Suppress unsan warning.

Suppress known undefined behavior sanitizer warning.

In TrigDecisionTool, also need to Remove dependency of the main library on PyROOT.

Move the functions Trig::BuildTransientTrees and Trig::DestroyTransientTrees, which are only called from python, into the dictionary library. In that way, we can remove the dependency of libTrigDecisionTool.so on PyROOT.