Allow editing visual bounds from ui

[Wumpf]

What

• Fixes First draft of generic UI for space view properties #6237

This also introduces the concept of multiline editors - didn't want to split it out since then I'd be lacking a working example for it, but commits are split along that falt line.
With introduction of multiline editors I refactored the view property ui functionality such that parts will be more reusable in the future.

bounds_editing2.mp4

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[abey79]

Great stuff again!

[abey79]

Here I'm wondering if whether we can is obscuring whether we should :) The UX is not bad, but a bit surprising. Let's see what people think about it—I'd remove it if it induces too much confusion.