TxList and AddressList classes for Liquid

[stepansnigirev]

This PR improves the compatibility of Liquid functionality with Bitcoin functionality of Specter. Fixes some issues in Liquid like tracking of used addresses (still shows 0 amount though).
PR is getting pretty big so I decided to make it now and continue integration work in the next ones.

Core changes:

• Wallet class creates _transactions and _addresses cache not from hard-coded classes but from one defined in the class. This means LWallet can just use different classes and the rest of functions remain the same.
• LAddressList class allows lookups not only by confidential address but also by unconfidential addresses. The returned value is a confidential address.
• TxList stores full raw transaction not in CSV but in a separate directory now. Storing raw transactions in CSV was causing problems if tx is too large (either in case of liquid with all the proofs or just huge bitcoin transactions)
• Export to CSV now doesn't include raw transactions (causing problems for people, reported in Telegram channel)

Other changes

• get_address_from_dict is slightly modified to support more options where address or addresses is stored - can be directly in the dict or in scriptPubKey of it. Raises an error if address is not found or address is Fee (liquid)
• gettransaction function in the wallet can accept more arguments: full if you need hex field with full hex transaction, decode if you want to decode transaction.
• Other minor changes