Replace the autogenerated Core class with something more smart

The server_qtro and server_qtro_simulator templates both generate a "Core" class, which is used to support reading connection settings saved in the server.conf settings file, as well as setting up a QRemoteObjectRegistryHost class.

Once the connection handling is more transparent in QtIvi, it should be investigated on whether it is possible to get rid of the Core class completely and/or replace it with something more smart.

E.g. instead of creating the QRemoteObjectRegistryHost class for the user and managing it, it should be the user who takes care of it and the autogenerated code should just provide some helpful information, like a default registry Url.