Add option to keep popup open after clicking on item

[Tunous]

Adds a way to specify for each item whether clicking on it should dismiss the popup or keep it visible. It can be specified by setting the dismissOnSelect property.

Example

val popupMenu = popupMenu {
     section {
        /* ... */
        item {
            label = "Stay open when clicked"
            dismissOnSelect = false
            callback = {
                Toast.makeText(this@LightActivity, "Clicked!", Toast.LENGTH_SHORT).show()
            }
        }
    }
}