Experimental implementation for webapp plugins (#7185)

* Start of experimental implementation for webapp plugins

* Updates to webapp plugin architecture

* Update pluggable test

* Remove debug code

webapp/plugins/pluggable/index.js

@@ -0,0 +1,17 @@
+// Copyright (c) 2017 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+import {connect} from 'react-redux';
+import {getTheme} from 'mattermost-redux/selectors/entities/preferences';
+
+import Pluggable from './pluggable.jsx';
+
+function mapStateToProps(state, ownProps) {
+    return {
+        ...ownProps,
+        components: state.plugins.components,
+        theme: getTheme(state)
+    };
+}
+
+export default connect(mapStateToProps)(Pluggable);