hs485d: create the channels of a new device with their channel class

[hobbyquaker]

SetDeviceDescription() built every channel of a device found by a bus search or by its own announcement as a plain HS485Channel and ignored the channel class of the device description. Only a device loaded from its file got its channels through AddChannel(), which creates the class the description names. So channel 0 of a newly learned wired device was no HS485MaintenanceChannel until hs485d was restarted: getValue() of UNREACH, STICKY_UNREACH and CONFIG_PENDING answered false with a warning, and a failed send fired no UNREACH event and left no service message. Rebuild() creates the channels of a device whose type changed the same way.

Both now create the channels with AddChannel(), as the load path does, and fall back to a plain channel if that fails.

Fixes #166

[coderabbitai]

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