Bevy 0.17 compatibility patch

[HaHa421]

I've created a fork of bevy_vello compatible with Bevy 0.17:
https://github.com/HaHa421/bevy_vello-bevy-0.17

It's used in my migration of woodpecker_ui:
https://github.com/HaHa421/woodpecker_ui-bevy-0.17

This issue is mainly for visibility and future tracking.
Feel free to ping me if you'd like to discuss integration or test compatibility.

[nuzzles]

velato 0.7 and vello_svg are now released, so a 0.17 version is unblocked.

[HaHa421]

nice, almost there! but the CI fails for wasm32

[johnbchron]

Something should probably be done about the difference between UiTransform/UiGlobalTransform and Transform/GlobalTransform. Layout positions are now stored in UiGlobalTransform, meaning you can't just put a scene on a Node entity and it work anymore.

[RobertBrewitz]

Personally I use bevy_vello for both ui and world space in my main game project; But I think we should just upgrade to 0.17 best effort for UITransform/UiGlobalTransform for now.

And someone who has some wind in their sails can perhaps make an upgrade to support both UiTransforms and Transforms and keep or improve the current API.