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/locales/en.json

@@ -196,7 +196,8 @@
     "library": "Library",
     "lock": "Keep selected tool active after drawing",
     "penMode": "Prevent pinch-zoom and accept freedraw input only from pen",
-    "link": "Add/ Update link for a selected shape"
+    "link": "Add/ Update link for a selected shape",
+    "eraser": "Eraser"
   },
   "headings": {
     "canvasActions": "Canvas actions",
@@ -221,7 +222,8 @@
     "placeImage": "Click to place the image, or click and drag to set its size manually",
     "publishLibrary": "Publish your own library",
     "bindTextToElement": "Press enter to add text",
-    "deepBoxSelect": "Hold CtrlOrCmd to deep select, and to prevent dragging"
+    "deepBoxSelect": "Hold CtrlOrCmd to deep select, and to prevent dragging",
+    "eraserRevert": "Hold Alt to revert the elements marked for deletion"
   },
   "canvasError": {
     "cannotShowPreview": "Cannot show preview",