Foldable State Events

Implement folding sections for multiple consecutive state events. This also reworks some of the aggregated text output:

- Only new days cause a new section
- The aggregated text starts with either a single username or n users
- If the same user did the same action mutltiple times it will be in the aggregated text a user did x n times
- When there are multiple authors in a block with multiple state event types it will use or rather than and before the last event. e.g 3 user left the room or joined the room.

Folded

![image](/uploads/17141ed5e1f2e0e3539523a082275976/image.png)

Unfolded

![image](/uploads/1d5db5804da457b921544cc81099997d/image.png)

Implements network/neochat#90

src/models/messageeventmodel.cpp

@@ -67,6 +67,7 @@ QHash<int, QByteArray> MessageEventModel::roleNames() const
     roles[IsNameChangeRole] = "isNameChange";
     roles[IsAvatarChangeRole] = "isAvatarChange";
     roles[IsRedactedRole] = "isRedacted";
+    roles[GenericDisplayRole] = "genericDisplay";
     return roles;
 }
 
@@ -462,6 +463,14 @@ QVariant MessageEventModel::data(const QModelIndex &idx, int role) const
         return m_currentRoom->eventToString(evt, Qt::RichText);
     }
 
+    if (role == GenericDisplayRole) {
+        if (evt.isRedacted()) {
+            return i18n("<i>[This message was deleted]</i>");
+        }
+
+        return m_currentRoom->eventToGenericString(evt);
+    }
+
     if (role == FormattedBodyRole) {
         if (auto e = eventCast<const RoomMessageEvent>(&evt)) {
             if (e->hasTextContent() && e->mimeType().name() != "text/plain") {