refactor: remove LocalHelper

`LocalHelper` is unused currently, so remove it for simplicity

BREAKING CHANGE: The private `localHelper` property has been removed

Author: Ray Schamp

package.json

@@ -27,7 +27,6 @@
     "arraybuffer-loader": "^1.0.3",
     "base64-js": "1.2.1",
     "js-md5": "0.6.1",
-    "localforage": "1.5.0",
     "nets": "3.2.0",
     "text-encoding": "0.6.4"
   },

src/LocalHelper.js

@@ -1,5 +1,4 @@
 const BuiltinHelper = require('./BuiltinHelper');
-const LocalHelper = require('./LocalHelper');
 const WebHelper = require('./WebHelper');
 
 const _Asset = require('./Asset');
@@ -12,8 +11,6 @@ class ScratchStorage {
 
         this.builtinHelper = new BuiltinHelper(this);
         this.webHelper = new WebHelper(this);
-        this.localHelper = new LocalHelper(this);
-
         this.builtinHelper.registerDefaultAssets(this);
     }
 
@@ -125,7 +122,7 @@ class ScratchStorage {
      */
     load (assetType, assetId, dataFormat) {
         /** @type {Helper[]} */
-        const helpers = [this.builtinHelper, this.localHelper, this.webHelper];
+        const helpers = [this.builtinHelper, this.webHelper];
         const errors = [];
         let helperIndex = 0;
         dataFormat = dataFormat || assetType.runtimeFormat;