rename commands/importers that list modules
Removed variants Catmandu::Importer::Modules

The importers only differ in the 'namespace' option that can also be
specified directly instead of bloating the Catmandu core code base.

Further simplification is possible by merging duplicated code in parts of
Catmandu::Cmd::{importers,exporters,fixes,stores,modules}.
Adding info command deleting obsolete exporers, importers modules
command
Deleting obsolere modules commands
Milla Build
Merge branch 'nichtich-info-commands' into dev
Deleting obsolete fixes command