Jelle Raaijmakers 7b0adee487 LibGfx+Overall: Remove is_null from Point, Rect and Size ...

Having a `Point`, `Rect` or `Size` claim it's `null` is silly. We have
`Optional<T>` for that. For `Point`, rename `is_null` to `is_zero` to
better reflect what we're testing. For `Rect` and `Size`, `is_null` is
removed outright.

Also, remove `is_empty` from `Point`. Points can't be empty.

2022-12-28 22:32:21 -05:00

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