refactor: remove ToBytes and FromBytes implementations

These traits no longer exist upstream. Instead we should be using
the `CanonicalDeserialize` or `CanonicalSerialize` traits:

arkworks-rs/algebra#417

src/serialize.rs

@@ -1,47 +1,10 @@
 use std::convert::TryInto;
 
-use ark_ff::{FromBytes, ToBytes};
 use ark_serialize::{CanonicalDeserialize, CanonicalSerialize};
 use ark_std::io::{Read, Result as IoResult, Write};
 
 use crate::{AffineElement, Element, Encoding, FieldExt, Fq};
 
-impl ToBytes for Element {
-    #[inline]
-    fn write<W: Write>(&self, mut writer: W) -> IoResult<()> {
-        let field_element = self.vartime_compress_to_field();
-        let bytes: [u8; 32] = field_element.to_bytes();
-        bytes.write(&mut writer)
-    }
-}
-
-impl FromBytes for Element {
-    #[inline]
-    fn read<R: Read>(mut reader: R) -> IoResult<Self> {
-        let field_element = Fq::read(&mut reader)?;
-        let element = Encoding(field_element.to_bytes())
-            .vartime_decompress()
-            .map_err(|_| std::io::ErrorKind::InvalidData)?;
-        Ok(element)
-    }
-}
-
-impl ToBytes for AffineElement {
-    #[inline]
-    fn write<W: Write>(&self, mut writer: W) -> IoResult<()> {
-        let element: Element = self.into();
-        element.write(&mut writer)
-    }
-}
-
-impl FromBytes for AffineElement {
-    #[inline]
-    fn read<R: Read>(mut reader: R) -> IoResult<Self> {
-        let element = Element::read(&mut reader)?;
-        Ok(element.into())
-    }
-}
-
 impl CanonicalDeserialize for AffineElement {
     fn deserialize_with_mode<R: Read>(
         reader: R,