Add more currencies

[leto]

Let's add these currencies. If any of these are not supported by coingecko, then just leave that out:

• CNY
• RUB
• CAD
• SGD
• CHF
• INR
• GBP
• AUD

This site has useful info about the unicode currency symbols that we can use: https://www.xe.com/symbols.php

[leto]

100 HUSH bounty to add this, with correct unicode currency symbols for currencies supported by Coingecko and that have their currency symbol as unicode characters

[leto]

done