Initial implementation of a generic UI component (#61)

* Add generic component

* Add validation. Rename to widgetRenderer

* Remove test code from splash screen

* Clean up infobox

* Fix styling/layout

* Move test code into unit test

* Replace <input> and <labe> by <TextField> and <Text> respectively. Fix style.

* Replace InfoBoxComponent with UI fabric MessageBar. Fix styling for TextField

* Use MessageBar for error message

* Rename WdigetRendererComponent to SmartUiComponent

src/Explorer/Controls/RadioSwitchComponent/RadioSwitchComponent.less

@@ -0,0 +1,16 @@
+@import "../../../../less/Common/Constants.less";
+
+.radioSwitchComponent {
+  cursor: pointer;
+  display: flex;
+
+  &>span:nth-child(n+2) {
+    margin-left: 10px;
+  }
+
+  .caption {
+    color: @BaseDark;
+    padding-left: @SmallSpace;
+    vertical-align: top;
+  }
+}