Move some Meg/Olm session logic from Room::Private to Connection::Private

Functions (Room::Private::)createOlmSession, payloadForUserDevice
and sendRoomKeyToDevices don't have a lot to do with the given Room
object but deal with quite a few things stored in Connection. This
commit moves them to Connection::Private, exposing
sendSessionKeyToDevices (the new name for sendRoomKeyToDevices) in
Connection so that Room could call it from Room::P::sendMegolmSession().

While moving these over, a few additional things were adjusted:
- more functions marked as const
- a few functions could be moved now from Connection
  to Connection::Private
- false slots in Connection (such as picklingMode) are moved out of
  the slots block
- keys.yml in Matrix CS API definitions has been adjusted to match
  the real structure of `/claim` response (see quotient-im/matrix-spec
  repo); csapi/keys.h has been regenerated accordingly.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/csapi/keys.h b/lib/csapi/keys.h
index ce1ca9ed..bcf1ad41 100644
--- a/lib/csapi/keys.h
+++ b/lib/csapi/keys.h
@@ -207,9 +207,9 @@ public:
     ///
     /// See the [key algorithms](/client-server-api/#key-algorithms) section for
     /// information on the Key Object format.
-    QHash<QString, QHash<QString, QVariant>> oneTimeKeys() const
+    QHash<QString, QHash<QString, QJsonObject>> oneTimeKeys() const
     {
-        return loadFromJson<QHash<QString, QHash<QString, QVariant>>>(
+        return loadFromJson<QHash<QString, QHash<QString, QJsonObject>>>(
             "one_time_keys"_ls);
     }
 };