Raspberry Pi OS 12 (Bookworm) released

[bitlab]

@Tim Curtis I did keep it in separate branches because not to interfer with the 8.x.x release. When you are sure we are done with the 8.x.x release we merge the bookwork branches to the main/develop.
Another reason for holding back the merge for a while is that the develop for supporting CamillaDSP 2.x, currently only can be done with 8.x (requires working moOde ;-) ).