Change target sdk version to 30 for android project. Remove unused files.

lib/entities/wallet.dart

@@ -1,61 +0,0 @@
-//import 'package:mobx/mobx.dart';
-//import 'package:cw_core/sync_status.dart';
-//import 'package:cake_wallet/entities/transaction_history.dart';
-//import 'package:cw_core/wallet_type.dart';
-//import 'package:cake_wallet/entities/transaction_creation_credentials.dart';
-//import 'package:cake_wallet/entities/pending_transaction.dart';
-//import 'package:cw_core/balance.dart';
-//import 'package:cw_core/node.dart';
-
-//abstract class Wallet {
-//  WalletType getType();
-
-//  WalletType walletType;
-
-//  Observable<Balance> onBalanceChange;
-
-//  Observable<SyncStatus> syncStatus;
-
-//  Observable<String> get onNameChange;
-
-//  Observable<String> get onAddressChange;
-
-//  String get name;
-
-//  String get address;
-
-//  Future updateInfo();
-
-//  Future<String> getFilename();
-
-//  Future<String> getName();
-
-//  Future<String> getAddress();
-
-//  Future<String> getSeed();
-
-//  Future<Map<String, String>> getKeys();
-
-//  Future<String> getFullBalance();
-
-//  Future<String> getUnlockedBalance();
-
-//  Future<int> getCurrentHeight();
-
-//  Future<int> getNodeHeight();
-
-//  Future<bool> isConnected();
-
-//  Future close();
-
-//  TransactionHistory getHistory();
-
-//  Future connectToNode({Node node, bool useSSL = false, bool isLightWallet = false});
-
-//  Future startSync();
-
-//  Future<PendingTransaction> createTransaction(
-//      TransactionCreationCredentials credentials);
-
-//  Future rescan({int restoreHeight = 0});
-//}

lib/entities/wallets_manager.dart

@@ -1,18 +0,0 @@
-import 'package:cake_wallet/entities/wallet.dart';
-import 'package:cake_wallet/entities/wallet_description.dart';
-
-abstract class WalletsManager {
-  Future<Wallet> create(String name, String password, String language);
-
-  Future<Wallet> restoreFromSeed(
-      String name, String password, String seed, int restoreHeight);
-
-  Future<Wallet> restoreFromKeys(String name, String password, String language,
-      int restoreHeight, String address, String viewKey, String spendKey);
-
-  Future<Wallet> openWallet(String name, String password);
-
-  Future<bool> isWalletExit(String name);
-
-  Future remove(WalletDescription wallet);
-}