TrigConfigSvc: remove legacy configuration support and deprecate service
Remove the legacy trigger menu configuration support (
deprecate all interface methods. No client should be using this service
instance anymore. In a second step we can remove the
inheritance and possibly completely delete this service in favor of
LVL1/HLTConfigSvc directly where needed.
Also fix the
TrigDecisionTool setup in
T0TriggerGetter to use the official configuration methods.