Merge xmr_btc crate

Created network, storage and protocol modules. Organised
files into the modules where the belong.

xmr_btc crate moved into isolated modulein swap crate.

Remove the xmr_btc module and integrate into swap crate.

Consolidate message related code

Reorganise imports

Remove unused parent Message enum

Remove unused parent State enum

Remove unused dependencies from Cargo.toml

swap/src/database/alice.rs

@@ -1,14 +1,15 @@
-use crate::{alice::swap::AliceState, SwapAmounts};
 use bitcoin::hashes::core::fmt::Display;
 use serde::{Deserialize, Serialize};
-use xmr_btc::{
-    alice,
+
+use crate::{
     bitcoin::{EncryptedSignature, TxCancel, TxRefund},
     monero,
+    protocol::{alice, alice::swap::AliceState},
     serde::monero_private_key,
+    SwapAmounts,
 };
 
-// Large enum variant is fine because this is only used for storage
+// Large enum variant is fine because this is only used for database
 // and is dropped once written in DB.
 #[allow(clippy::large_enum_variant)]
 #[derive(Clone, Debug, Deserialize, Serialize, PartialEq)]

swap/src/database/bob.rs

@@ -1,7 +1,10 @@
-use crate::{bob::swap::BobState, SwapAmounts};
 use bitcoin::hashes::core::fmt::Display;
 use serde::{Deserialize, Serialize};
-use xmr_btc::bob;
+
+use crate::{
+    protocol::{bob, bob::swap::BobState},
+    SwapAmounts,
+};
 
 #[derive(Clone, Debug, Deserialize, Serialize, PartialEq)]
 pub enum Bob {