Revert "Add keycode table and switch to event.code in select places" (#224)

Using code instead of key is strongly warned against at MDN and causes issues with nonstandard layouts:
https://developer.mozilla.org/en-US/docs/Web/API/Element/keydown_event#keyboardevent.code

This also fixes ScriptEditorRoot.tsx, where some code snuck in that
wasn't using *any* of the constants.

This reverts commit 016a9a873f.

src/utils/helpers/keyCodes.ts

@@ -1,4 +1,4 @@
-/** Keyboard key codes as returned by event.key */
+/** Keyboard key codes */
 export enum KEY {
   //SHIFT: 16, // Check by `&& event.shiftKey`
   //CTRL: 17, // Check by `&& event.ctrlKey`
@@ -69,67 +69,3 @@ export enum KEY {
   Y = "y",
   Z = "z",
 }
-
-/** Keyboard key codes as returned by event.code */
-export enum KEYCODE {
-  //SHIFT: 16, // Check by `&& event.shiftKey`
-  //CTRL: 17, // Check by `&& event.ctrlKey`
-  //ALT: 18, // Check by `&& event.altKey`
-  ENTER = "Enter",
-  ESC = "Escape",
-  TAB = "Tab",
-  SPACE = "Space",
-  BACKSPACE = "Backspace",
-  UP_ARROW = "ArrowUp",
-  DOWN_ARROW = "ArrowDown",
-  LEFT_ARROW = "ArrowLeft",
-  RIGHT_ARROW = "ArrowRight",
-
-  BACKWARD_SLASH = "Backslash",
-  BACKQUOTE = "Backquote",
-  COMMA = "Comma",
-  DOT = "Period",
-  EQUAL = "Equal",
-  FORWARD_SLASH = "Slash",
-  HYPHEN = "Minus",
-  SEMICOLON = "Semicolon",
-  QUOTE = "Quote",
-
-  k0 = "Digit0",
-  k1 = "Digit1",
-  k2 = "Digit2",
-  k3 = "Digit3",
-  k4 = "Digit4",
-  k5 = "Digit5",
-  k6 = "Digit6",
-  k7 = "Digit7",
-  k8 = "Digit8",
-  k9 = "Digit9",
-
-  A = "KeyA",
-  B = "KeyB",
-  C = "KeyC",
-  D = "KeyD",
-  E = "KeyE",
-  F = "KeyF",
-  G = "KeyG",
-  H = "KeyH",
-  I = "KeyI",
-  J = "KeyJ",
-  K = "KeyK",
-  L = "KeyL",
-  M = "KeyM",
-  N = "KeyN",
-  O = "KeyO",
-  P = "KeyP",
-  Q = "KeyQ",
-  R = "KeyR",
-  S = "KeyS",
-  T = "KeyT",
-  U = "KeyU",
-  V = "KeyV",
-  W = "KeyW",
-  X = "KeyX",
-  Y = "KeyY",
-  Z = "KeyZ",
-}