Update `ChatDocumentHandler` so `RoomManger` is no longer required for saving the text in the chatbar between room switches. This is achieved by allowing `ChatDocumentHandler` to get the correct `ChatBarChache` itself rather than having to have it passed from `ChatBar.qml`. This avoids any race conditions.
Separate out a base `MessageContentModel` that can be extended to get the component types from different places. This is used currently for `EventMessageContentModel` but will be used later as part of the rich chat bar.
All display text is now in the text component so it never needs special casing. This also cleans up some of the model parameters so more things come from attributes including location and file data (which was already a qvariantmap anyway).
Also cleaned up the itinerary and file enhancement views,
Add a dev setting to allow relations to be sent to any message using the right click delegate menu. This shouldn't be a main feature, but since it's technically allowed in matrix this will help any future debugging
And optionally show an error message, if libQuotient gets one. This
helps in certain rare situations where you just *Cannot* download
something. Before, NeoChat would just reset the image or video without
telling you anything but now there's a nice big error message telling
you what's wrong.
The video thumbnail is no longer hidden while loading. This makes it
look less buggy (like NeoChat forgot what the thumbnail was) while
loading a large video. To help with contrast, a slight background tint
is added.
