- move bitcoin wallet links from coins_details.override.json to a separate
wallets.json file
- drop NanoWallet links from nem nem_mosaics.json, auto-add them in
coins_details.py instead
- move misc wallet links to misc.json
- clean out override file
- change wallet format in coins_details.json:
- they're now list instead of dict, so that we can specify ordering
- add Trezor Beta wallet link to ETH/ETC and their tokens
- somewhat stricter checking of trezor.io wallet data
