[bisq-network/bisq] [WIP] Add segwit support to the BTC wallet (#4568)

[Oscar Guindzberg]

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This is just the BTC wallet.
Trade protocol keeps using legacy addresses. 
This PR does not require a hardfork.
You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/4568

-- Commit Summary --

  * Use bitcoinj 0.15.8 (commit 9cdd3b4)
  * Create a P2WPKH keychain for new btc wallets
  * Add a P2WPKH keychain for existing wallets
  * AddressEntry: Add boolean segwit flag
  * Stop using LegacyAddress for btc addresses
  * Fix log msg in BtcCoinSelector
  * Comment out segwit BSQ account path
  * TradeWalletService: adapt to segwit wallet
  * WalletService: adapt to segwit wallet
  * New AddressEntry: use different script types
  * AddressEntryList: arbitrator entry use P2PKH
  * Add segwit/legacy checbox for address creation
  * Serialize tx without segwit
  * Don't create an extra address at startup
  * Don't create a wallet address when not needed
  * Remove unused WalletService.findKeyFromPubKeyHash()
  * Remove unused WalletService.freshKey()
  * Remove unused import

-- File Changes --

    M build.gradle (2)
    M core/src/main/java/bisq/core/app/WalletAppSetup.java (2)
    M core/src/main/java/bisq/core/btc/model/AddressEntry.java (26)
    M core/src/main/java/bisq/core/btc/model/AddressEntryList.java (31)
    M core/src/main/java/bisq/core/btc/setup/BisqKeyChainGroupStructure.java (12)
    M core/src/main/java/bisq/core/btc/setup/WalletConfig.java (14)
    M core/src/main/java/bisq/core/btc/wallet/BtcCoinSelector.java (2)
    M core/src/main/java/bisq/core/btc/wallet/BtcWalletService.java (50)
    M core/src/main/java/bisq/core/btc/wallet/TradeWalletService.java (61)
    M core/src/main/java/bisq/core/btc/wallet/WalletService.java (54)
    M core/src/main/resources/i18n/displayStrings.properties (1)
    M desktop/src/main/java/bisq/desktop/main/funds/deposit/DepositView.java (25)
    M gradle/witness/gradle-witness.gradle (2)
    M proto/src/main/proto/pb.proto (1)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4568.patch
https://github.com/bisq-network/bisq/pull/4568.diff

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