proposal: add bytesof Property, reduce pointer/cast requires

[Janice Caron]

> byte[] bytesOf(T)(ref T t)
> {
>     return (cast(byte*)&t)[0 .. t.sizeof];
> }
>
> byteArray[i .. i + struct.var.sizeof] = bytesOf(structVar);
> sendPacket(bytesOf(structVar));

That's the way to do it!

But since bytesOf() operates on an array, one could presumably also write

    sendPacket(structVar.bytesOf);

which is what the orignal poster wanted. (Isn't D great?)