Refactor: simplify module call definitions (#24)

* Refactor: simplify module call definitions

* Fix compilation errors after merge

* Add missing comments and remove unused imports

* Now it compiles

src/codec.rs

@@ -1,8 +1,4 @@
-use parity_scale_codec::{
-    Encode,
-    EncodeAsRef,
-    HasCompact,
-};
+use parity_scale_codec::Encode;
 
 #[derive(Clone)]
 pub struct Encoded(pub Vec<u8>);
@@ -12,9 +8,3 @@ impl Encode for Encoded {
         self.0.to_owned()
     }
 }
-
-pub fn compact<T: HasCompact>(t: T) -> Encoded {
-    let encodable: <<T as HasCompact>::Type as EncodeAsRef<'_, T>>::RefType =
-        From::from(&t);
-    Encoded(encodable.encode())
-}