Add Pirate DEX gateway

[gades]

General

Add PirateCash DEX The Pirate DEX was launched 2019 and right now only here is BCC (https://coinpaprika.com/coin/bcc-bitconnect/#!exchanges) and Cosanta (https://coinpaprika.com/coin/cosa-cosanta/#!exchanges)

Also, Pirate DEX have PirateCash - https://coinmarketcap.com/currencies/piratecash/

Thanks

Code Preparation

• Check for unused code
• No unrelated changes are included
• None of the changed files are reformatting only
• Code is self explanatory or documented
• All written text is properly translated (english language)

Testing

• [х] Chrome
• Opera
• Firefox
• Safari

[sschiessl-bcp]

Hi @gades, please contact me in Telegram (sschiessl)