Add changelog files for 2d and core

CHANGELOG.md

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+See the following package-specific changelogs:
+
+- [`@hex-engine/core`](packages/core/CHANGELOG.md)
+- [`@hex-engine/2d`](packages/2d/CHANGELOG.md)

packages/2d/CHANGELOG.md

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+# Changelog
+
+# 0.3.0
+
+## Upgraded `@hex-engine/core` to 0.3.0 (breaking change)
+
+- `useIsEnabled` has been removed; use `useEnableDisable().isEnabled` instead
+- `StateAccumulator` APIs (`useStateAccumulator`, `useListenerAccumulator`, `Component.stateAccumulator`, `Entity.stateAccumulator`) have been removed. Persist state in components instead:
+
+```ts
+// Before
+const FRUITS = Symbol("FRUITS");
+
+function MyComponent() {
+	// To persist state per-MyComponent:
+	const fruits = useStateAccumulator<string>(FRUITS);
+	// Or, to persist state per-entity:
+	const fruits = useEntity().stateAccumulator<string>(FRUITS);
+	// Or, to persist state in the root entity:
+	const fruits = useRootEntity().stateAccumulator<string>(FRUITS);
+
+	// Do something with fruits
+}
+
+// After
+function FruitStorage() {
+	useType(FruitStorage);
+
+	return {
+		fruits: new Set<string>();
+	}
+}
+
+function MyComponent() {
+	// To persist state per-MyComponent:
+	const {fruits} = useNewComponent(FruitStorage);
+	// Or, to persist state per-entity:
+	const {fruits} = useEntity().getComponent(FruitStorage) || useNewComponent(FruitStorage);
+	// Or, to persist state in the root entity:
+	const {fruits} = useRootEntity().getComponent(FruitStorage) || useNewRootComponent(FruitStorage);
+
+	// Do something with fruits
+}
+```
+
+## Implicit `Physics.Engine`
+
+If you try to use a `Physics.Body` without having a `Physics.Engine` on the root component, it used to throw an error asking you to add one to the root component. Now, it will instead create one for you (with default settings). If you create your own `Physics.Engine` on the root component, then the behaviour is the same as it was prior to 0.3.0.
+
+# 0.2.0
+
+## `Vector`, `Angle`, and `Point` changes (breaking change)
+
+- `Vector` and `Angle` have been removed; their methods and properties have been moved into `Point`.
+- `Point` has been renamed to `Vector`.
+- All places where `Angle` instances were present before, now bare numbers are used. For instance, `Geometry`'s `rotation` property used to be an `Angle`, but now it's a `number`.
+
+# 0.1.0
+
+Not documented

packages/core/CHANGELOG.md

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+# Changelog
+
+# 0.3.0
+
+## `useIsEnabled` removed
+
+Use `useEnableDisable().isEnabled` instead.
+
+## `StateAccumulator` APIs removed
+
+`useStateAccumulator`, `useListenerAccumulator`, `Component.stateAccumulator`, and `Entity.stateAccumulator` have been removed. Persist state in components instead:
+
+```ts
+// Before
+const FRUITS = Symbol("FRUITS");
+
+function MyComponent() {
+	// To persist state per-MyComponent:
+	const fruits = useStateAccumulator<string>(FRUITS);
+	// Or, to persist state per-entity:
+	const fruits = useEntity().stateAccumulator<string>(FRUITS);
+	// Or, to persist state in the root entity:
+	const fruits = useRootEntity().stateAccumulator<string>(FRUITS);
+
+	// Do something with fruits
+}
+
+// After
+function FruitStorage() {
+	useType(FruitStorage);
+
+	return {
+		fruits: new Set<string>();
+	}
+}
+
+function MyComponent() {
+	// To persist state per-MyComponent:
+	const {fruits} = useNewComponent(FruitStorage);
+	// Or, to persist state per-entity:
+	const {fruits} = useEntity().getComponent(FruitStorage) || useNewComponent(FruitStorage);
+	// Or, to persist state in the root entity:
+	const {fruits} = useRootEntity().getComponent(FruitStorage) || useNewRootComponent(FruitStorage);
+
+	// Do something with fruits
+}
+```
+
+## Implicit `RunLoop`
+
+Previously, if you tried to use `useFrame` without a `RunLoop` present on the root component, an error would be thrown. Now, a `RunLoop` will be created for you. If there is already a `RunLoop` present when you call `useFrame`, it won't create another one.
+
+# 0.1.0
+
+Not documented