Move bitcoin and monero parts into self modules.

cw_bitcoin/lib/electrum_wallet_snapshot.dart

@@ -0,0 +1,42 @@
+import 'dart:convert';
+import 'package:cw_bitcoin/bitcoin_address_record.dart';
+import 'package:cw_bitcoin/electrum_balance.dart';
+import 'package:cw_bitcoin/file.dart';
+import 'package:cw_core/pathForWallet.dart';
+import 'package:cw_core/wallet_type.dart';
+
+class ElectrumWallletSnapshot {
+  ElectrumWallletSnapshot(this.name, this.type, this.password);
+
+  final String name;
+  final String password;
+  final WalletType type;
+
+  String mnemonic;
+  List<BitcoinAddressRecord> addresses;
+  ElectrumBalance balance;
+  int accountIndex;
+
+  Future<void> load() async {
+    try {
+      final path = await pathForWallet(name: name, type: type);
+      final jsonSource = await read(path: path, password: password);
+      final data = json.decode(jsonSource) as Map;
+      final addressesTmp = data['addresses'] as List ?? <Object>[];
+      mnemonic = data['mnemonic'] as String;
+      addresses = addressesTmp
+          .whereType<String>()
+          .map((addr) => BitcoinAddressRecord.fromJSON(addr))
+          .toList();
+      balance = ElectrumBalance.fromJSON(data['balance'] as String) ??
+          ElectrumBalance(confirmed: 0, unconfirmed: 0);
+      accountIndex = 0;
+
+      try {
+        accountIndex = int.parse(data['account_index'] as String);
+      } catch (_) {}
+    } catch (e) {
+      print(e);
+    }
+  }
+}