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.
This is to avoid including app-specific functionality in storage and
avoid circular imports. The following policy is now in effect: modules
from `storage` namespace must not import from `apps` namespace.
In most files, the change only involves changing import paths.
A minor refactor was needed in case of webauthn: basic get/set/delete
functionality was left in storage.webauthn, and more advanced logic on
top of it was moved to apps.webauthn.resident_credentials.
A significant refactor was needed for sd_salt, where application (and
UI) logic was tightly coupled with the IO code. This is now separated,
and storage.sd_salt deals exclusively with the IO side, while the app/UI
logic is implemented on top of it in apps.common.sd_salt and
apps.management.sd_protect.
