BTCDisplay updated to V2

Current BTC and ETH price displayed on Papirus Zero ePaper display for Raspberry Pi Zero

Changes in V2:

• BTC and ETH supported and shown in USD and EUR
• Display layout changes
• Adding amount of BTC and ETH owned to show personal wallet value
• Changed to coingecko API instead of coindesk, for support of all cryptocoins
• Removed "wait or buy" indicator, because of... No dips expected :-D

Hardware:

• Raspberry Pi Zero W
• Papirus ePaper Display 2.0" (https://github.com/PiSupply/PaPiRus)