Add browser-polyfills, remove lodash assign, compact, values

(re: #6087)

modules/core/difference.js

@@ -1,7 +1,6 @@
 import _difference from 'lodash-es/difference';
 import _each from 'lodash-es/each';
 import _isEqual from 'lodash-es/isEqual';
-import _values from 'lodash-es/values';
 
 
 /*
@@ -167,7 +166,7 @@ export function coreDifference(base, head) {
             }
         }
 
-        return _values(relevant);
+        return Object.values(relevant);
     };
 
 

modules/core/graph.js

@@ -1,4 +1,3 @@
-import _assign from 'lodash-es/assign';
 import _difference from 'lodash-es/difference';
 import _includes from 'lodash-es/includes';
 import _without from 'lodash-es/without';
@@ -12,9 +11,9 @@ export function coreGraph(other, mutable) {
 
     if (other instanceof coreGraph) {
         var base = other.base();
-        this.entities = _assign(Object.create(base.entities), other.entities);
-        this._parentWays = _assign(Object.create(base.parentWays), other._parentWays);
-        this._parentRels = _assign(Object.create(base.parentRels), other._parentRels);
+        this.entities = Object.assign(Object.create(base.entities), other.entities);
+        this._parentWays = Object.assign(Object.create(base.parentWays), other._parentWays);
+        this._parentRels = Object.assign(Object.create(base.parentRels), other._parentRels);
 
     } else {
         this.entities = Object.create({});

modules/core/history.js

@@ -10,7 +10,6 @@ import _forEach from 'lodash-es/forEach';
 import _map from 'lodash-es/map';
 import _omit from 'lodash-es/omit';
 import _reject from 'lodash-es/reject';
-import _values from 'lodash-es/values';
 import _without from 'lodash-es/without';
 import _uniq from 'lodash-es/uniq';
 
@@ -23,11 +22,7 @@ import { coreGraph } from './graph';
 import { coreTree } from './tree';
 import { osmEntity } from '../osm/entity';
 import { uiLoading } from '../ui';
-
-import {
-    utilRebind,
-    utilSessionMutex
-} from '../util';
+import { utilRebind, utilSessionMutex } from '../util';
 
 
 export function coreHistory(context) {
@@ -472,8 +467,8 @@ export function coreHistory(context) {
 
             return JSON.stringify({
                 version: 3,
-                entities: _values(allEntities),
-                baseEntities: _values(baseEntities),
+                entities: Object.values(allEntities),
+                baseEntities: Object.values(baseEntities),
                 stack: s,
                 nextIDs: osmEntity.id.next,
                 index: _index