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/InputCombination.js

@@ -0,0 +1,8 @@
+import IInput from "./IInput"
+
+/** @typedef {import("../Blueprint.js").default} Blueprint */
+
+export default class InputCombination {
+
+    constructor() { }
+}