Modify the URL class by replacing the text attribute with the src_url attribute.

[pagbabian-splunk]

The current URL object uses an attribute text of type URL String. This attribute name is very general for being typed as URL String, and wouldn't be useful in other classes, as for example the value attribute as String is reused. Therefore, it makes more sense to remove text as URL String from the dictionary if it isn't used elsewhere (so far it is not), and replace it with src_url which has been re-typed as URL String.

This would change references to the url attribute from url.text to url.src_url the downside of which is a somewhat redundant descriptive name. url.value would have been more accurate but the value attribute is generic and of type String, not URL String, so could fail validation.

Note that this breaks any current implementation usage.