ContentUnavailableView support

[filbrej]

Using the enum values with ContentUnavailableView doesn't work.

Example:

        ContentUnavailableView(
            "No saved documents",
            systemImage: .documentFill, // Throws error, Type 'String' has no member 'documentFill'
            description: Text(
                "You have no saved documents yet. Use the button below to scan your first document."
            )
        )

[jollyjinx]

thanx for pointing out this issue, have you gotten around it ? if so send me a pull request otherwise I'll have a look when I get to it.

[filbrej]

I have not gotten to it