* Improved multi-keyrings management and added backed for filecoin requests * Rename BraveCoins -> CoinType * Change coin indexes to meet BIP-0044 * Change CoinType.FILECOIN -> CoinType.FIL
* Improved multi-keyrings management and added backed for filecoin requests * Rename BraveCoins -> CoinType * Change coin indexes to meet BIP-0044 * Change CoinType.FILECOIN -> CoinType.FIL