Make Connection::sendToDevices() an actual slot

Although Qt 5 didn't complain about that, you could never really use
sendToDevices() in its slot (or even invocable) capacity because
Qt's meta-type system could not handle move-only UsersToDevicesToEvents.
Qt 6 is more stringent; the build fails at trying to instantiate
QMetaType for that type (with a rather unhelpful error message thrown
by Clang, and more helpful but very verbose diagnostic from MSVC)
because it does not provide a copy constructor.

However, sendToDevice doesn't really need to have full-blown events
in that parameter; just the content of the event is equally fine.
This commit does exactly that: replaces UsersToDevicesToEvents with
UsersToDevicesToContent that contains QJsonObject's instead of
EventPtr's. The code around is updated accordingly.

Also: factor out the key event JSON creation from
makeMessageEventForSessionKey() because it's the same JSON for each
target device; the function therefore is called encryptSessionKeyEvent()
now.

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