stop using require with ethereumjs/ deps

apps/remix-ide/src/blockchain/providers/injected.js

@@ -1,5 +1,5 @@
 const Web3 = require('web3')
-const { hashPersonalMessage } = require('@ethereumjs/util')
+import { hashPersonalMessage } from '@ethereumjs/util'
 
 class InjectedProvider {
   constructor (executionContext) {

apps/remix-ide/src/blockchain/providers/node.js

@@ -1,5 +1,5 @@
 const Web3 = require('web3')
-const { hashPersonalMessage } = require('@ethereumjs/util')
+import { hashPersonalMessage } from '@ethereumjs/util'
 const Personal = require('web3-eth-personal')
 
 class NodeProvider {

apps/remix-ide/src/blockchain/providers/vm.js

@@ -1,5 +1,5 @@
 const Web3 = require('web3')
-const { privateToAddress, hashPersonalMessage } = require('@ethereumjs/util')
+import { privateToAddress, hashPersonalMessage } from '@ethereumjs/util'
 import BN from 'bn.js'
 const { extend } = require('@remix-project/remix-simulator')
 class VMProvider {

apps/remix-ide/src/lib/helper.js

@@ -1,7 +1,7 @@
 var async = require('async')
-const ethJSUtil = require('@ethereumjs/util')
+import { toChecksumAddress } from '@ethereumjs/util'
 
-module.exports = {
+export default  {
   shortenAddress: function (address, etherBalance) {
     var len = address.length
     return address.slice(0, 5) + '...' + address.slice(len - 5, len) + (etherBalance ? ' (' + etherBalance.toString() + ' ether)' : '')
@@ -14,7 +14,7 @@ module.exports = {
     if (address.indexOf('0x') === -1) {
       address = '0x' + address
     }
-    return ethJSUtil.toChecksumAddress(address)
+    return toChecksumAddress(address)
   },
   shortenHexData: function (data) {
     if (!data) return ''