abstract udapp plugin so it maintains backwards compatibilify with the plugin api

src/app.js

@@ -23,6 +23,7 @@ var CompilerMetadata = require('./app/files/compiler-metadata')
 var CompilerImport = require('./app/compiler/compiler-imports')
 
 const Blockchain = require('./blockchain/blockchain.js')
+const PluginUDapp = require('./blockchain/pluginUDapp.js')
 
 const PluginManagerComponent = require('./app/components/plugin-manager-component')
 const CompilersArtefacts = require('./app/compiler/compiler-artefacts')
@@ -223,6 +224,7 @@ Please make a backup of your contracts and start using http://remix.ethereum.org
   registry.put({api: fileManager, name: 'filemanager'})
 
   const blockchain = new Blockchain(registry.get('config').api)
+  const pluginUdapp = new PluginUDapp(blockchain)
 
   // ----------------- compilation metadata generation servive ----------------------------
   const compilerMetadataGenerator = new CompilerMetadata(blockchain, fileManager, registry.get('config').api)
@@ -295,6 +297,7 @@ Please make a backup of your contracts and start using http://remix.ethereum.org
   )
   const run = new RunTab(
     blockchain,
+    pluginUdapp,
     registry.get('config').api,
     registry.get('filemanager').api,
     registry.get('editor').api,

src/app/udapp/run-tab.js

@@ -33,8 +33,8 @@ const profile = {
 
 export class RunTab extends LibraryPlugin {
 
-  constructor (blockchain, config, fileManager, editor, filePanel, compilersArtefacts, networkModule, mainView) {
-    super(blockchain.udapp, profile)
+  constructor (blockchain, pluginUDapp, config, fileManager, editor, filePanel, compilersArtefacts, networkModule, mainView) {
+    super(pluginUDapp, profile)
     this.event = new EventManager()
     this.config = config
     this.blockchain = blockchain

src/blockchain/pluginUDapp.js

+const { EventEmitter } = require('events')
+
+class PluginUdapp {
+
+  constructor (blockchain) {
+    this.blockchain = blockchain
+    this.events = new EventEmitter()
+    this.setupEvents()
+  }
+
+  setupEvents () {
+    this.blockchain.event.register('newTransaction', (tx, receipt) => {
+      this.events.trigger('newTransaction', [tx, receipt])
+    })
+  }
+
+  createVMAccount (newAccount) {
+    return this.blockchain.udapp.createVMAccount(newAccount)
+  }
+
+  sendTransaction (tx) {
+    return this.blockchain.udapp.sendTransaction(tx)
+  }
+
+  getAccounts (cb) {
+    return this.blockchain.udapp.getAccounts(cb)
+  }
+
+  pendingTransactionsCount () {
+    return this.blockchain.udapp.pendingTransactionsCount()
+  }
+
+}
+
+module.exports = PluginUdapp

src/blockchain/universalDapp.js

@@ -6,7 +6,6 @@ const { EventEmitter } = require('events')
 const remixLib = require('remix-lib')
 
 const TxRunner = remixLib.execution.txRunner
-const txHelper = remixLib.execution.txHelper
 const EventManager = remixLib.EventManager
 const Web3 = require('web3')