Serde impl (again) (#31)

Adds optional serde dependency
Implementing Deserialize and Serialize for EaseFunction

Cargo.toml

@@ -22,6 +22,7 @@ bevy = { version = "0.13.0", default-features = false }
 bevy_time_runner = { version = "0.1.4", default-features = false, features = ["bevy_app", "bevy_reflect"] }
 bevy_lookup_curve = { version = "0.2.1", optional = true }
 bevy_eventlistener = { version = "0.7.0", optional = true }
+serde = { version = "1", optional = true, features = ["derive"] }
 
 [dev-dependencies]
 bevy-inspector-egui = "0.23"
@@ -50,6 +51,8 @@ bevy_sprite = [ "bevy/bevy_sprite", "bevy_render" ]
 bevy_eventlistener = [ "dep:bevy_eventlistener", "bevy_time_runner/bevy_eventlistener" ]
 # Supports for `bevy_lookup_curve` (https://github.com/villor/bevy_lookup_curve)
 bevy_lookup_curve = [ "dep:bevy_lookup_curve" ]
+# Derive Serialize and Deserialize for some types
+serde = [ "dep:serde" ]
 
 [package.metadata.docs.rs]
 all-features = true

src/interpolation.rs

@@ -13,6 +13,8 @@ use bevy::prelude::*;
 
 use crate::{tween::TweenInterpolationValue, TweenSystemSet};
 use bevy_time_runner::TimeSpanProgress;
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
 
 #[cfg(feature = "bevy_lookup_curve")]
 pub mod bevy_lookup_curve;
@@ -59,6 +61,7 @@ impl Plugin for EaseFunctionPlugin {
 #[allow(missing_docs)]
 #[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Component, Reflect)]
 #[reflect(Component)]
+#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
 pub enum EaseFunction {
     #[default]
     /// ```txt