React bootstrap upgrade to v1, migrate to react-beautiful-dnd (#1639)

* Upgrade packages, fix errors, still WIP

* WIP

* Bootstrap v4 upgrade

* Switch to react-beautiful-dnd

* Fixed some issues

* Added to generate signed Mac build for UX

* PR feedback

* Missed one

* PR feedback

src/renderer/css/components/AddServerModal.css

@@ -72,7 +72,7 @@ label {
   outline: 0;
 }
 
-.help-block {
+.form-text {
   display: block;
   margin-top: 5px;
   margin-bottom: 10px;
@@ -173,7 +173,7 @@ button.default:focus {
   color: #a94442;
 }
 
-.has-error .form-control {
+:invalid .form-control {
   border-color: #a94442;
 }