Add ordering rule group setting for property elements and content properties

[grochocki]

From @punker76: It would be nice to have Element Ordering Rule Groups like Attribute Ordering Rule Groups e.g. to group style Setters in the same way.

I know, there is already a setting to reorder Setters, but not to (pre)group this like the attribute ordering does. e.g. I would prefer putting Template setters (Template, HeaderTemplate, ContentTemplate...) to the end of a style...

Should also order Style Setters.

Resources:

• Property element syntax
• XAML Content properties

[grochocki]

While we have done something similar with VisualStateManager, this may be trickier. A few open questions:

• Can we leverage the same attribute ordering setting?
• Do we need a new setting? If so, how closely should it mirror how we handle attribute ordering (e.g., wildcards)?