DBRIGHT Sync with other multiplayer users#378

It would be very useful if the DBRIGHT display could be synchronized between all players in a multiplayer session.

In multiplayer, different users often work separate positions, such as Tower and Ground. When one user adjusts DBRITE settings, separation markers, filters, range, or other relevant display options, those changes should optionally be visible to the other users as well.

This would make coordination much easier, especially during busy traffic periods. Everyone would be looking at the same operational picture instead of silently wondering why the other controller appears to be working in a different universe or can see the state of other planes not on your freq.

This would improve teamwork, reduce confusion, and make multiplayer sessions feel more like a coordinated tower environment.