feat: Add Eraser 🎉 (#4887)

* feat: Add Eraser 🎉

* Eraser working

* remove unused state

* fix

* toggle eraser

* Support deselect with Alt/Option

* rename actionDelete -> actionErase

* Add util isEraserActive

* show eraser in mobile

* render eraser conditionally in mobile

* use selection if eraser in local storage state

* Add sampling to erase accurately

* use pointerDownState

* set eraser to false in AllowedExcalidrawElementTypes

* rename/reword fixes

* don't use updateScene

* handle bound text when erasing

* fix hover state in mobile

* consider all hitElements instead of a single

* code improvements

* revert to select if eraser active and elements selected

* show eraser in zenmode

* erase element when clicked on element while eraser active

* set groupIds to empty when eraser active

* fix test

* remove dragged distance

src/element/showSelectedShapeActions.ts

@@ -10,5 +10,6 @@ export const showSelectedShapeActions = (
     !appState.viewModeEnabled &&
       (appState.editingElement ||
         getSelectedElements(elements, appState).length ||
-        appState.elementType !== "selection"),
+        (appState.elementType !== "selection" &&
+          appState.elementType !== "eraser")),
   );