refactor: remove ZFunction (#64)

Removes `ZFunction` from the render pipeline completely. Z Functions were an artifact of my needs at a time before bevy_vello was merged into Linebender. They are an opinionated component that will calculate a new Z-index used for rendering for the user, with one of many functions that would make sense for 2.5D games, 2D platformers, etc. Ultimately there's nothing special about Z Functions, they are just a convenience that can easily exist outside of the rendering pipeline using a system that changes the Z-value for an asset's transform on Update, which is why I'm removing them. This will help to heighten maintainability by reducing quite a bit of code, and be less confusing for users who would've encountered these.
linebender · Jul 20, 2024 · 5d900d7 · 5d900d7
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -10,6 +10,10 @@ Subheadings to categorize changes are `added, changed, deprecated, removed, fixe
 
 ## Unreleased
 
+### Removed
+
+- Removed `ZFunction`s from the render pipeline. Now ordering is based solely on the `Transform`'s z component. If you dependeded on this behavior, you'll need to adjust the transform Z in a system prior to render.
+
 ## 0.5.1
 
 ### Fixed

diff --git a/Cargo.toml b/Cargo.toml
@@ -5,7 +5,6 @@ members = [
   "examples/demo",
   "examples/drag_n_drop",
   "examples/text",
-  "examples/z_ordering",
   "examples/scene",
   "examples/svg",
   "examples/lottie",

diff --git a/examples/z_ordering/Cargo.toml b/examples/z_ordering/Cargo.toml
diff --git a/examples/z_ordering/src/assets/fonts/LICENSE b/examples/z_ordering/src/assets/fonts/LICENSE
diff --git a/examples/z_ordering/src/assets/fonts/Rubik-Medium.ttf b/examples/z_ordering/src/assets/fonts/Rubik-Medium.ttf