scenario1:
- 2of2 multisig wallet with trezor1 and trezor2 keystores
- only trezor2 connected
- previously we would pair first keystore with connected device and then display error.
now we will pair the device with the correct keystore on the first try
scenario2:
- standard wallet with trezor1 keystore
- trezor2 connected (different device)
- previously we would pair trezor2 with the keystore and then display error.
now we will prompt the user to select which device to pair with (out of one)
related: #5789
this is a regression from #5721
Removed the `TxInput.is_coinbase` method as I think it is a confusing API,
instead we now have `TxInput.is_coinbase_input` and `TxInput.is_coinbase_output`.
related #5872
Make sure that a pubkey is only appended to the checkpub array if it
corresponds to a change address. Signing will fail otherwise, if a
non-change pubkey is sent as part of the checkpub list to the Digital
BitBox.
use common cross-thread HTTP method, which is put in network.py,
since that is where the proxy is. TrustedCoin tested successfully,
but DigitalBitbox can't be tested completely due to #4903
before this commit, digitalbitbox would not use any proxying
we should not raise generic Exception when wanting to communicate with
the user. it makes distinguishing programming errors and messages hard,
as the caller will necessarily need to catch all Exceptions then
