Fix hit handling in the Message widget

[kevinaboos]

Ensure that the Message widget's child widgets receive the hits
that they should, which is all hits not related to opening the new
message context menu

See makepad/makepad#636

Remove ClickableView.

[aaravlu]

It seems that the part2 of issue #271 also need Hit event?
If it's this while it has not been fixed, I shall pause #322 temporarily and make a point of finishing #323

[kevinaboos]

It seems that the part2 of issue #271 also need Hit event? If it's this while it has not been fixed, I shall pause #322 temporarily and make a point of finishing #323

Yes, you're correct, it does require this to be fixed first.