Option to prevent local subscriptions

Optionally suppress data for local subscribers (i.e. local subscribers will not match). In this case a local subscriber is in the same process (or node? TBD) as the publisher.

## Detailed information

Add option to subscribers (and maybe publishers) that does prevent local subscription. By default it is off, i.e. the system behaves as it does now and local subscribers receive data.

RouDi already has the necessary process information to incorporate this options in its publisher/subscriber matching strategy.

## Use Cases
ROS2, CycloneDDS, gateways/bridges etc.