Moved Bytes interface to dcb-bytes crate.

Instead of implementing `Bytes for Option<T>`, a proxy is now used, as `dcb-bytes` is in a separate crate.

dcb-bytes/src/bytes.rs

@@ -0,0 +1,39 @@
+//! Interface for converting various structures to and from bytes
+
+// Imports
+use std::error::Error;
+
+/// Conversions to and from bytes for the game file
+pub trait Bytes
+where
+	Self: Sized,
+{
+	/// The type of array required by this structure
+	type ByteArray: ByteArray;
+
+	/// The error type used for the operation
+	type FromError: Error;
+
+	/// The error type used for the operation
+	type ToError: Error;
+
+	/// Constructs this structure from `bytes`
+	fn from_bytes(bytes: &Self::ByteArray) -> Result<Self, Self::FromError>;
+
+	/// Writes this structure to `bytes`
+	fn to_bytes(&self, bytes: &mut Self::ByteArray) -> Result<(), Self::ToError>;
+}
+
+/// A trait for restricting `Bytes::ByteArray`
+pub trait ByteArray {
+	/// Size of this array
+	const SIZE: usize;
+}
+
+impl<const N: usize> ByteArray for [u8; N] {
+	const SIZE: usize = N;
+}
+
+impl ByteArray for u8 {
+	const SIZE: usize = 1;
+}