Upgrade the package

[mattesmohr]

This merge tackles the latest ideas and issues (#134, #138).

Conditional attributes

In the past you had to use the modify method to alter an attribute for an element based on a condition.

Input()
    .modify(if: true) {
       $0.checked()
    }

Now you can use the condition on the attribute with the same result.

Input()
   .checked(true)

Keep in mind not every attribute has a conditional option for now. I have added it to attributes, where I think it makes the most sense. If you find an attribute in the future, where you think it makes sense, let me know.

The modify method still exists. I am thinking about to remove it as we can use an if let to unwrap an optional too, but thats a topic for a different time.

Environment value

You can now pass an environment value to an attribute. Currently it is only available for the source attribute. The same applies here as for the conditional attributes, I am not sure for what attribute it makes sense or doesn't.

@EnvironmentObject(Asset.self)
asset

Figure {
    Image()
        .source(asset.path) /// was not possible before
    FigureCaption {
       asset.caption /// was possible before
    }
}