Deserializing BDAddr from non-borrowed string without clone

[ekuinox]

There was a problem with deserialization when using toml crates, so I fixed it.

I often use toml files to configure my own software, but the following deserialization using toml was failing.

#[derive(Deserialize, PartialEq, Copy, Clone, Debug)]
struct Data {
    addr: BDAddr,
}

toml::from_str(r#"addr = "ff00ff00ff00""#) // error: A colon seperated Bluetooth address, like `00:11:22:33:44:55`

[qwandor]

Please rebase this on the dev branch.

[ekuinox]

It seems that it was already supported in the dev branch. (70ee65c #408 )
This was handled using Cow, but I don't see a problem with returning BDAddr directly in the Visitor. I think it would eliminate the need to allocate Cow.

[qwandor]

Thanks!