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;
+  }
+}

src/Explorer/Controls/RadioSwitchComponent/RadioSwitchComponent.tsx

@@ -0,0 +1,51 @@
+/**
+ * Horizontal switch component
+ */
+
+import * as React from "react";
+import "./RadioSwitchComponent.less";
+import { Icon } from "office-ui-fabric-react/lib/Icon";
+import { NormalizedEventKey } from "../../../Common/Constants";
+
+export interface Choice {
+  key: string;
+  onSelect: () => void;
+  label: string;
+}
+
+export interface RadioSwitchComponentProps {
+  choices: Choice[];
+  selectedKey: string;
+  onSelectionKeyChange?: (newValue: string) => void;
+}
+
+export class RadioSwitchComponent extends React.Component<RadioSwitchComponentProps> {
+  public render(): JSX.Element {
+    return (
+      <div className="radioSwitchComponent">
+        {this.props.choices.map((choice: Choice) => (
+          <span
+            tabIndex={0}
+            key={choice.key}
+            onClick={() => this.onSelect(choice)}
+            onKeyPress={event => this.onKeyPress(event, choice)}
+          >
+            <Icon iconName={this.props.selectedKey === choice.key ? "RadioBtnOn" : "RadioBtnOff"} />
+            <span className="caption">{choice.label}</span>
+          </span>
+        ))}
+      </div>
+    );
+  }
+
+  private onSelect(choice: Choice): void {
+    this.props.onSelectionKeyChange && this.props.onSelectionKeyChange(choice.key);
+    choice.onSelect();
+  }
+
+  private onKeyPress(event: React.KeyboardEvent<HTMLSpanElement>, choice: Choice): void {
+    if (event.key === NormalizedEventKey.Enter || event.key === NormalizedEventKey.Space) {
+      this.onSelect(choice);
+    }
+  }
+}