refactor code to use Shrinkwraprs and diesel-derive-newtype (#598)

* add shrinkwraprs and implement Id thru it

This also means we can automatically convert Id to String without using
.into()!

* cleanup with the help of clippy!

* cleanup with the help of cargo fmt!

* remove extra block

* Shrinkwrap Page, ContentLen and RemoteForm

* translations

plume-models/src/comments.rs

@@ -236,10 +236,7 @@ impl FromId<PlumeRocket> for Comment {
                     })?,
                     author_id: User::from_id(
                         c,
-                        &{
-                            let res: String = note.object_props.attributed_to_link::<Id>()?.into();
-                            res
-                        },
+                        &note.object_props.attributed_to_link::<Id>()?,
                         None,
                     )
                     .map_err(|(_, e)| e)?