please review changes to allow global installation

Enclosed are some changes I made to allow the global installation of your plugin - these were necessary so that I could create a debian package.

Note the following changes:

1. the local & global folder-name is now "fileorganizer" not "fileorganizer-gtk3" - the use of rb.find-plugin-file requires that the plugin module and foldername needs to be the same.
2. the config file is now copied from a template folder into the local user folder location - i.e. from the global /usr/share location to ~/.local/share etc