Initial commit to allow hex encoded transaction param

src/app/execution/txFormat.js

@@ -47,14 +47,19 @@ module.exports = {
     */
   buildData: function (contractName, contract, contracts, isConstructor, funAbi, params, udapp, callback, callbackStep) {
     var funArgs = ''
+    var data = ''
+    var dataHex = ''
+
+    if (params.startsWith('"0x')) {
+      dataHex = params.match(/"(.*?)"/)[1].replace('0x', '')
+      data = Buffer.from(dataHex, 'hex')
+    } else {
       try {
         funArgs = $.parseJSON('[' + params + ']')
       } catch (e) {
         callback('Error encoding arguments: ' + e)
         return
       }
-    var data = ''
-    var dataHex = ''
       if (!isConstructor || funArgs.length > 0) {
         try {
           data = helper.encodeParams(funAbi, funArgs)
@@ -70,6 +75,7 @@ module.exports = {
       if (data.slice(0, 2) === '0x') {
         dataHex = data.slice(2)
       }
+    }
     var contractBytecode
     if (isConstructor) {
       contractBytecode = contract.evm.bytecode.object