Add Thorchain Base support

Add weth9 and unwrap call (gemwalletcom#351)

Integrate Thorchain ERC20 swaps

Set recipient to multicall handler (gemwalletcom#350)

Fix bitcoincash prefix for thorchain memo generation

Add minimum_byte_fee to BitcoinChainConfig

Revert "Fix bitcoincash prefix for thorchain memo generation"

This reverts commit e178a1d.

Fix bitcoincash prefix for thorchain memo generation

Enable BitcoinCash in Thorchain provider

Add Cardano primitives