Allow color to initialize from an existing color object

Setting a 2d object's color to be random is great, however it's difficult to
re-use that color without manually extracting out the rgba values from that
color object. Ideally it would be convenient to be able to do this:

```ruby
square = Square.new(color: 'random')
square_two = Square.new(color: square.color)
```

This patch allows this behavior from any 2d shape, making it much easier to
reuse those random colors :)

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