In order to guarantee all the plugin type names are displayed properly,
the 'pluginname' string call has been replaced to the proper
$plugininfo->displayname setting. That way, the plugin names will
be always displayed using the proper string translation.
This commit moves the presets subsystem to a location within the admin
folder, which is more appropriate given its purpose and reduces
developer frustration with tab completion of the admin directory.
Paul Holden