22.0-cleanup-TrkAmbiguityProcessor

Work continued in context of ATLIDTRKCP-193. Largely formatting changes, some incidental introduction of usage of const references in place of copies and also ATH_MSG macros. One slightly larger change in the SimpleAmbiguityProcessor: To avoid copying the track collection to a vector before using process_vector, I have changed the signature of process_vector to use the track collection directly, and updated the implementation of both overloads of the 'process' method to allow this.