We already have both rand 0.8 and rand 0.9
in our dependency tree.
We still need rand 0.8 because
public APIs of rPGP 0.17.0 and Iroh 0.35.0
use rand 0.8 types in public APIs,
so it is imported as rand_old.
The setting is already removed from the UIs,
but users who had it disabled previously have
no way to enable it. After this change
encryption is effectively always preferred.
This change replaces
usage of `reqwest` and `hyper-util`
with custom connection establishment code
so it is done in the same way
as for IMAP and SMTP connections.
This way we control HTTP, IMAP and SMTP
connection establishment
and schedule connection attempts
to resolved IP addresses
in the same way for all 3 protocols.
Notification server uses APNS server
for heartbeat notifications,
so registering FCM tokens there
will result in failing to notify them
and unregistering them anyway.
