MuonIdCnv: add templated base class for all muon technologies
Massive code cleanup of the muon detector description converters.
Instead of copy&pasting the same code for each muon technology, introduce a templated base class
that contains the code. Each technology then only needs to instantiate it with the correct IdHelper
type
and its name.
Also fixes Gaudi deprecation warnings (ATEAM-1020).
Edited by Frank Winklmeier