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/SmartUi/SmartUiComponent.less

@@ -0,0 +1,14 @@
+@import "../../../../less/Common/Constants.less";
+
+.widgetRendererContainer {
+  text-align: left;
+
+  .inputLabelContainer {
+    margin-bottom: 4px;
+
+    .inputLabel {
+      color: #393939;
+      font-weight: 600;
+    }
+  }
+}