implemented gplugin_plugin_manager_(un)?register_loader to use the new model of a hash table containing a GSList of loaders keyed on the extensions.  Still need to implement the free function, but just about done.
implemented gplugin_plugin_manager_(un)?register_loader to use the new model of a hash table containing a GSList of loaders keyed on the extensions.  Still need to implement the free function, but just about done.

tieto/gplugin-pkg,tieto/gplugin-pkg,tieto/gplugin-pkg,tieto/gplugin-pkg