Re-add extensions as top level dir

extensions/ohif-cornerstone-extension/src/ToolbarModule.js

@@ -0,0 +1,39 @@
+import React, { Component } from 'react';
+import PropTypes from 'prop-types';
+import ConnectedToolbarSection from './ConnectedToolbarSection';
+import { ToolbarButton } from 'react-viewerbase';
+import ConnectedCineDialog from './ConnectedCineDialog';
+
+class ToolbarModule extends Component {
+  state = {
+    cineDialogOpen: false
+  }
+
+  onClickCineToolbarButton = () => {
+    this.setState({
+      cineDialogOpen: !this.state.cineDialogOpen
+    });
+  };
+
+  render() {
+    const cineDialogContainerStyle = {
+      display: this.state.cineDialogOpen ? 'inline-block' : 'none'
+    };
+
+    return (<div className="ToolbarModule">
+      <ConnectedToolbarSection />
+      <ToolbarButton
+        active={this.state.cineDialogOpen}
+        onClick={this.onClickCineToolbarButton}
+        text={'CINE'}
+        iconClasses={'fab fa-youtube'}
+        />
+        <div className="CineDialogContainer" style={cineDialogContainerStyle}>
+          <ConnectedCineDialog />
+        </div>
+      </div>
+    );
+  }
+}
+
+export default ToolbarModule;