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
It turns out that for whatever reason ListView.posiitionViewAtEnd() ignores any whitespace. This means that when we use the function it goes to the last delegate. This is no good as we have some padding at the bottom to make space for the typing indicator.
So the fix for this is stupid and involves adding a "spacer" delegate to the timeline beginning model which is completely invisible but qml see as a delegate so we can both leave the space and properly position the view at the end.
BUG: 501075
