* Add test for ui-z system
* Remove generic hierarchy runner and refactor ui z-system
* Remove different handling for childless nodes
Having an empty children list should be the same as having no child
component.
* Further simplify system after change
* Remove cfg!(feature = "metal-auto-capture")
This cfg! has existed since the initial commit, but the corresponding
feature has never been part of Cargo.toml
* Remove unnecessary handle_create_window_events call
* Remove EventLoopProxyPtr wrapper
* Remove unnecessary statics
* Fix unrelated deprecation warning to fix CI
Transform and GlobalTransform are now Similarities.
This resolves precision errors and simplifies the api
Co-authored-by: Carter Anderson <mcanders1@gmail.com>