Now all opt values enter into a _opts function instead of the original.
This avoids a lot of verbosity for both None in the case opts are
unwanted, and Some() if they actually are.
They are used like so:
```rust
client.container().from("...");
client.container_opts(Some(ContainerOpts{ ... }))
```
Some from opts will be removed in a future commit/pr
This will make the api much easier to use, as we can now rely on ""
instead of "".into() for normal string values.
Introduced builder as well, which makes it much easier to use *Opts, as
it can handle the building of that, and get the benefits from String ->
&str, as that is currently not allowed for optional values
