The Z-level for the "Hide media" and other overlay controls were lost
during the rich text refactor, and now restored. I also made it so the
blurhash is now used when the media is hidden, and when hiding media it
no longer allows you to jumpscare yourself by maximizing the media when
you probably didn't actually want to.
When the media doesn't have blurhash, it falls back to black.
- Don't show the hide button
- Shrink them to better fit
- Allow a little more maxh height in the chatbar for attachments
- Make sure that the button states work properly when adding and removing images
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,
