Rp2

* -s CLI option to read missing spot prices from Web: rewrote implementation from Yahoo Finance (daily granularity) to Coinbase Pro (minute granularity)
* moved cache logic to its own module, so it can be used in multiple places: plugins, transaction_resolver, etc.
* fixed issue 19: the user needs to pass -s to read highly granular price data from Coinbase Pro, when it's missing (or computed as 0)

* merged PR 18: Coinbase plugin wasn't handling crypto conversions correctly and generated negative amounts.

* merged PR 14: in Coinbase Pro plugin crypto fee is now modeled correctly both for buy and sell-side fills
* fixed issue 16: added support for inflation_reward transaction in Coinbase plugin
* added load caching to speed up development (PR 12)
* added parallelism to Coinbase plugin (PR 12)

* fixed issue 16: added support for Coinbase inflation reward transaction
* added error log for unknown transaction type in all plugins, so they are easy to identify and report
* added FAQ on supported exchanges/wallets
* added support for more transaction types in BlockFi plugin (PR 11)

* fixed bug reported in issue https://github.com/eprbell/dali-rp2/issues/10
* fixed from/to_currency detection in Coinbase Pro plugin (PR 9)
* added initial version of developer FAQ document: https://github.com/eprbell/dali-rp2/blob/main/docs/developer_faq.md
* minor fixes to documentation

* fixed a bug in transaction resolver: IN -> IN transaction hint was assigning wrong value to fiat_fee
* fixed a bug in Coinbase plugin: receiving a crypto gift from another Coinbase user generated a transaction with wrong fiat_in_with_fee value
* reworked some of the code to use latest RP2 features: specifically fee-only transactions and crypto_fee in in-transactions. E.g.: Coinbase Pro coin swap code, transaction resolver INTRA -> OUT transaction hint application, etc.
* DaLI output file (the RP2 input file) now has in-transaction crypto_fee. Also updated unit test golden file
* refactored all transaction constructor calls to use keyword arg calling style
* updated setup.cfg dependencies to latest RP2