URL previews don't wrap

[lampholder]

Reported alongside element-hq/element-web#6693

[bmarty]

Other issues to fix on UrlPreview:

• They are not clickable. It should open the link
• Read receipt are displayed above. They should be displayed below
• Two sticky to the next message. Missing margin bottom?
• Left bar is to large and sometimes too high
• XML layout can be simplified, as long as Java code
• UrlPreview are not persistent when scrolling in the room
• Sometimes URLPreview does not contain link. It should fallback to the url itself (as Riot web does) This is actually the ase in the screenshot below.
• When clicking on the link, the text of the link is replaced by the url of the link

[bmarty]

It's better now:

[bmarty]

Replaced by #2574