Refactor (#862)

* Initial factoring out of parts of the LayerUI component

2360 → 2224 LOC

* Create a Section component

* Break up src/index.tsx

* Refactor actions to reduce duplication, fix CSS

Also consolidate icons

* Move scene/data.ts to its own directory

* Fix accidental reverts, banish further single-character variables

* ACTIVE_ELEM_COLOR → ACTIVE_ELEMENT_COLOR

* Further refactoring the icons file

* Log all errors

* Pointer Event polyfill to make the tests work

* add test hooks & fix tests

Co-authored-by: dwelle <luzar.david@gmail.com>

src/actions/actionSelectAll.ts

@@ -1,7 +1,7 @@
-import { Action } from "./types";
 import { KEYS } from "../keys";
+import { register } from "./register";
 
-export const actionSelectAll: Action = {
+export const actionSelectAll = register({
   name: "selectAll",
   perform: elements => {
     return {
@@ -10,4 +10,4 @@ export const actionSelectAll: Action = {
   },
   contextItemLabel: "labels.selectAll",
   keyTest: event => event[KEYS.META] && event.key === "a",
-};
+});