Script opcode and data support

Overrides the shift-left operator for pushing opcodes onto the Script,
matching the notation used in zcashd.

zcash_primitives/src/transaction/components.rs

@@ -7,7 +7,7 @@ use sapling_crypto::{
 };
 use std::io::{self, Read, Write};
 
-use serialize::Vector;
+use legacy::Script;
 use JUBJUB;
 
 // π_A + π_B + π_C
@@ -58,20 +58,6 @@ impl Amount {
     }
 }
 
-#[derive(Debug)]
-pub struct Script(pub Vec<u8>);
-
-impl Script {
-    pub fn read<R: Read>(mut reader: R) -> io::Result<Self> {
-        let script = Vector::read(&mut reader, |r| r.read_u8())?;
-        Ok(Script(script))
-    }
-
-    pub fn write<W: Write>(&self, mut writer: W) -> io::Result<()> {
-        Vector::write(&mut writer, &self.0, |w, e| w.write_u8(*e))
-    }
-}
-
 #[derive(Debug)]
 pub struct OutPoint {
     hash: [u8; 32],