Export to cointracker/bitcoin.tax/etc. CSV formats

[nuttycom]

Is your feature request related to a problem? Please describe.

Tax time is soon! We need to make it as easy as possible for our users to satisfy their tax reporting requirements.

Describe the solution you'd like

Add a feature to Zashi that permits the export of transaction data in the CSV format(s) required for a few popular cryptocurrency tax calculation tools.

[nuttycom]

https://support.cointracker.io/hc/en-us/articles/4413071299729-How-to-Convert-Your-Transaction-History-into-CoinTracker-Compatible-CSV-Format

https://bitcointaxes.zendesk.com/hc/en-us/articles/360009111074-Standard-CSV-Formatting-Sample-Files

[nuttycom]

Maybe find additional options by reviewing e.g. https://coinledger.io/tools/best-crypto-tax-software - but each service we decide to support a format for should be heavily vetted. This article itself is published by a service for crypto tax reporting, so it should be taken just as a starting point for investigation (though a couple of the apps it references are reputable, they include the services I've linked formats for above.)