Provides Rect::new()

[rustbasic]

I've sometimes wondered why there's no Rect::new() , but I see no reason why it shouldn't be provided.

[Mingun]

I think, because it may be unclear, what the numbers mean. It is:

• position of two corners?
• position of a corner and size?
• position of a center and size?

Because fields of Rect are public, constructing struct directly allows to write self-documenting code.

[emilk]

Rect::from_min_max already covers this, and better