ZF-8583: Add "mappers" to the module autoloader
Beside services and models, you may want to store your own mappers in your modules as well. Thus the module resource autoloader should also have a "mappers" => "Mapper" directive in its standard definition.
As we currently have Model_DbTable mapped to models/DbTable we would probably either want to map Model_Mapper to models/Mapper, as Ralph would agree, but I still think that mappers belong to their own directory in the modules' root.
This topic needs further discussion.