Move attributes to separate NuGet package

[adv12]

It would be nice if I could sprinkle [PropertyOrder] attributes on object properties in a models project without pulling in all of Avalonia. I haven't looked beyond the PropertyGrid, but are there possibly some other core, non-UI-dependent aspects of this library that could be broken into a separate NuGet package appropriate for non-GUI projects? I understand it all has to get hooked together in the end, but I'd feel better about my architecture if this were the case.

[mameolan]

Hi adv12,
you are right. I will think about this. In my option it depends on how many non UI classes I will need to port WPF controls to Avalonia. Let's see.

regards