Add jet hypo tools compatible with the current hypo scheme including the use of Decision objects.

The template pattern used until now whereby the base class calls methods on derived classes
to obtain details for a given hypo scenario (and where the concrete objects thus obtained are used
through used though interfaces) has been replaced by th use of a single Tool (TrigJetHypoToolMT)
which obtains the scenario dpendent objects through delegation to a ITrigJetHypoToolConfig.

TrigJetHypoToolMT will be configured with the approriate concrete implementation of ITrigJetHypoToolConfig.

For now, only one such implementation exists: TrigJetHypoToolConfig_EtaEt.


Former-commit-id: 93ef5590