Restore the functionality to edit or reply to the last message in the `chatbar`.
This is achieved be moving the functions `getLastLocalUserMessageEventId` and `getLatestMessageFromRow` to `NeoChatRoom` as `editLastMessage` and `replyLastMessage` as `chatbar` no longer has access to `messageEventModel`.
The functions are also simplified as they only need to find the `eventId` and always from row 0 as this was the only use of the functions.
BUG: 469733
Create a reaction model that provides all the required data for `ReactionDelegate` so that none need to be calculated in QML.
This also cleans up the API for `ReactionDelegate`
Limit the maximum number of avatars shown for other user read markers and collapsed state events
For state events \

For read markers \

This move the finding of links and the creation of a `linkpreviewer` into c++.
- The links are now extracted from the text in `texthandler`
- The `messageeventmodel` now creates and stores `linkpreviewers` for events that have links in the current room.
Two new model roles have been created to let a text delegate know when the link preview should be shown (`showLinkPreview`) and pass the link previewer (`linkPreviewer`). Empty link previewer are returned where link don't exist so the qml doesn't have to have checks for whether the parameters are undefined.
Create a `messageeventmodel` role for media info and reply media info that is a QMap with all the required data.
This replaces the MediaUrlRole, FileMimeTypeRole and the ContentTypeRole. The reply role no longer needs the content role.
This also ensures mxc urls are now generated for replies. All the media parameters will now have default values assigned in the model so the QML no longer needs to do this.
- Update the message event and user models so that the full source url is output.
- Separate the reply author into its own role
- Create an empty user object that can be passed so that the QML code no longer needs to check if certain parameters exist.
- Make avatarForMember return and empty QUrl if a valid avatar cannot be found and make use in the user and event models
As well as cleaning up the QML this should also stop the QML Image: Media id '' doesn't follow server/mediaId pattern spam in the log.
Update the message role to be named plainText and use it the message delegate for openMessageContext.
This removes the need for plainText in controller so it is removed.
Change location marker to GPS icon, make sure the point is the anchor and colour it with highlight colour
m.self \

m.pin \

Rework the filtering of state events in the timeline and for lastevent. This is now consistent everywhere and includes the following:
- The timeline settings are obeyed everywhere
- A new setting is added to filter all state events
- Last event obeys the timeline setting in all cases
- The roomlist will show a state event as the latest event if it's visible in the timeline
- Names are no longer hyperlinked in eventToString if plaintext is selected.
BUG: 455048\
Closesnetwork/neochat#148
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

Unfolded

Implements network/neochat#90