Marconi_Server: save/load settings in registry

Add server settings to save the server data to the registry, and
reload those settings at a latter time. Upon server shutdown, the
current settings are saved in the registry and can be reloaded later.

Location of saves in the registery is /Servers/Marconi\ Server/Settings.
Multiple sets of settings may be saved to different keys.
Marconi_Server: creates dir structure in registry

If the proper directory structure is not present in the registry,
it is created when the server starts up. This ensures that saving
and loading is always possible.