Refactor TemplatedClusterFinder and move to Tools

[jmmans]

ecal::TemplatedClusterFinder is actually a more-general tool than currently used. Sophie has copied it into Hcal for use there, but it would be better to put a clean separate version into Tools and use it from both Ecal and Hcal

The cluster finder doesn't care about anything specific to EcalHit or HcalHit anyway, so it can be refactored to run off CalorimeterHit.

[omar-moreno]

I would suggest to put this into the recon module.