They now live under trezor.ui.components.tt. Later
trezor.ui.components.t1 will be added and application code will be
rewritten to not use them directly in order to work on both TT and T1.
- core/bitcoin: move common files to the app's root
- core/bitcoin: use require_confirm instead of confirm
- core: move bitcoin unrelated functions from 'bitcoin' to a new 'misc' app
- core/bitcoin: use relative imports inside the app
- core: rename wallet app to bitcoin
- core/wallet: replace SigningErrors and the other exception classes with wire.Errors