This commit prepares the app for supporting multiple wallets. The seed
file can now store multiple mnemonics. The app is also not tied to a
single business object anymore, it can host and track several at the
same time.

Due to this change, the mechanism to start the business has been reworked.
This also fixes long standing issues coming from the legacy app where the
business was somehow tied to the foreground service and caused problems with
the background workers. We now use a singleton that can be accessed safely
from anywhere including the workers.

This commit is a WIP.

These files are also placed in their own package folder.

Depending on the device locale, the decimal separator may be a comma
or a dot character. If it's a comma it causes problems when converting
the string input to a Double, because the method expects a dot.

This commit also prevents entering more than 2 decimals for fiat amounts
in the currency converter. It caused a problem where the additional 3rd
decimal (which is actually not visible) would cause the underlying amount
to be updated, which in turn refreshes the fiat amount ; it makes the UX
look very weird.

Fixed issues with wallet reset and wallet creation
Move wallet UI components to correct package

Added a DataStoreManager to load/unload a preference file per
node id. Migration is not done yet.

Removed the global ambient userPrefs, instead use a nullable
LocalUserPrefs ambient that is updated when the active wallet
changes.

The screenlock mechanism now works by resetting the active wallet
which redirects to the startup screen. Entering the PIN/fingerprint
is handled by the startup screen.

Internal preferences are now per-wallet. Some preferences have been
moved to the global prefs.

Wallets now have an emoji avatar.

Removed the 3-dots button for the active wallet. Instead, the
currently active wallet is handled differently in the available
wallets list.

Also remove the deterministic random avatar, instead wallet meta
are created at startup if missing with a random avatar.

Screenlock is not tied to the wallet selector anymore, instead it
is tied to the startup screen. The startup screen is redesigned
with a simpler logic, where the active wallet is set explicitly.

Fixed issues with default wallet loading, and also start the wallet
if there's only one available.

taken from 511535c

This is more maintainable than a simple String. Also, this wallet id
is now the hash160 of the node id which is better for privacy and
also needed to handle the FCM messages.

This parameter was introduced and used only by the Android app because of
long standing issues with the background system, which have been fixed with
the multiple wallets support update.

Also decoupled the foreground service notification from the notifications
for received payments.

The headless state is now tracked per business. This avoid shutting
down all businesses when the foreground service shuts down.

Business monitoring jobs are now tracked with a type.

Also restored the watcher for the system notification permissions.

Removed scope from view models, and removed ambients shorthands that
assumed non-nullability too eagerly (e.g. business). This was causing
crashes when the device was rotated, or theme changed, because the
app was expecting values to exist in some screens, but they were not
yet restored.

Also, added a dialog to setup connection options when creating or
restoring a wallet.

A wallet should be automatically picked and started in some cases
which do not only depends on whether there's only 1 single wallet,
or if there's a default wallet. It also depends on how the app
got into the "locked" state.

For example, if the scren/device goes to sleep, the wallet should be
automatically locked, and as soon as the screen is on again, the
wallet that was used before should be loaded again, as soon as possible.

Also fix the notices viewmodel owner, and add a short message for this
specific notification.

…nner

Also fixed deeplink for swap-in wallet.