* Added compatibility between nodes on different Presets through `Mesh via UDP`
* Optimize multicast handling and channel mapping
- FloodingRouter: remove redundant UDP-encrypted rebroadcast suppression.
- Router: guard multicast fallback with HAS_UDP_MULTICAST and map fallback-decoded packets
to the local default channel via isDefaultChannel()
- UdpMulticastHandler: set transport_mechanism only after successful decode
* trunk fmt
* Move setting transport mechanism.
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Co-authored-by: GUVWAF <thijs@havinga.eu>
