Removed macro facets

Macros, placeholders, etc. will all be handled by std eventually so they shouldn't appear in the protocol or the host

orchid-base/src/msg.rs

@@ -13,4 +13,4 @@ pub fn recv_msg(read: &mut impl io::Read) -> io::Result<Vec<u8>> {
   let mut msg = vec![0u8; len as usize];
   read.read_exact(&mut msg)?;
   Ok(msg)
-}
+}