AddCustomer2Group.pl to OM
semi-automatic translation of bin/otrs.add* to Object Manager
Object Manager: restore explicit depency declarations

we will need them to implement deterministic order of destruction
LogObject depends on EncodeObject, no the other way round
Object Manager: explicit ordering of destruction

also adds a debug option that verifies that the objects actually
go away, and if not, uses Devel::Cycle (if available) to attempt
to print the object cycle that keeps it alive.