Input refactoring (#12)

* Fix folder name typo

* Smaller fixes

* Shortcut rename to Shortcuts

* Fix quoted attributes in UE 5.3

* remove KeyboardShortcutAction

* Remove more trivial classes

* Rename IKeyboardShortcut

* Node delete shortcut

js/input/mouse/MouseWheel.js

@@ -0,0 +1,62 @@
+import IPointing from "./IPointing.js"
+
+/** @typedef {import("../../Blueprint.js").default} Blueprint */
+
+export default class MouseWheel extends IPointing {
+
+    static #ignoreEvent =
+        /** @param {MouseWheel} self */
+        self => { }
+
+    #variation = 0
+    get variation() {
+        return this.#variation
+    }
+
+    /** @param {WheelEvent} e */
+    #mouseWheelHandler = e => {
+        if (this.enablerKey && !this.enablerActivated) {
+            return
+        }
+        e.preventDefault()
+        this.#variation = e.deltaY
+        this.setLocationFromEvent(e)
+        this.wheel()
+    }
+
+    /** @param {WheelEvent} e */
+    #mouseParentWheelHandler = e => e.preventDefault()
+
+    /**
+     * @param {HTMLElement} target
+     * @param {Blueprint} blueprint
+     * @param {Object} options
+     */
+    constructor(
+        target,
+        blueprint,
+        options = {},
+        onWheel = MouseWheel.#ignoreEvent,
+    ) {
+        options.listenOnFocus = true
+        options.strictTarget ??= false
+        super(target, blueprint, options)
+        this.strictTarget = options.strictTarget
+        this.onWheel = onWheel
+    }
+
+    listenEvents() {
+        this.movementSpace.addEventListener("wheel", this.#mouseWheelHandler, false)
+        this.movementSpace.parentElement?.addEventListener("wheel", this.#mouseParentWheelHandler)
+    }
+
+    unlistenEvents() {
+        this.movementSpace.removeEventListener("wheel", this.#mouseWheelHandler, false)
+        this.movementSpace.parentElement?.removeEventListener("wheel", this.#mouseParentWheelHandler)
+    }
+
+    /* Subclasses can override */
+    wheel() {
+        this.onWheel(this)
+    }
+}