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PackageTextTemplate will load its content at first usage of PackageTextTemplate#toString() or PackageTextTemplate#interpolate(Map) methods.
If its style/locale/variation/encoding are changed then it will reload its content.
AbstractLink uses a Behavior to render itself as disabled WICKET-4904
org.apache.wicket.markup.html.link.AbstractLink#getDisablingBehavior() is introduced. This method can return a non-null Behavior that can render markup for the Link in disabled mode.
By default org.apache.wicket.markup.html.link.DisableLinkBehavior is used. It uses AbstractLink#getBeforeDisabledLink and AbstractLink#getAfterDisabledLink to prepend/append additional markup and changes the <a> to <span>.
Deprecated classes/methods/fields are removed WICKET-5201
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