PLT-1752/PLT-3567/PLT-3998 Highlighting links in search, unit tests for autolinking (#3865)

* Added highlighting to links when their URL includes the search term

* Decoupling UserStore from react-router to allow for unit tests involving it

* PLT-3998 Added SiteURL as an option to be passed into the text formatting code

* Removed reference to PreferenceStore and window from TextFormatting

* Refactored TextFormatting to remove remaining browser-only code

* Updated ChannelHeader and MessageWrapper to match the changes to TextFormatting

* Increased max listeners for Preference and Emoji stores

* PLT-3832 Added automated unit tests for autolinking

* PLT-3567 Rerender posts when mention keywords change

* Updated RHS and search to match the changes to TextFormatting

* Broke TextFormatting's dependency on the UserStore

webapp/components/message_wrapper.jsx

@@ -2,6 +2,7 @@
 // See License.txt for license information.
 
 import * as TextFormatting from 'utils/text_formatting.jsx';
+import * as Utils from 'utils/utils.jsx';
 
 import React from 'react';
 
@@ -10,9 +11,19 @@ export default class MessageWrapper extends React.Component {
         super(props);
         this.state = {};
     }
+
     render() {
         if (this.props.message) {
-            return <div dangerouslySetInnerHTML={{__html: TextFormatting.formatText(this.props.message, this.props.options)}}/>;
+            const options = Object.assign({}, this.props.options, {
+                siteURL: Utils.getSiteURL()
+            });
+
+            return (
+                <div
+                    onClick={Utils.handleFormattedTextClick}
+                    dangerouslySetInnerHTML={{__html: TextFormatting.formatText(this.props.message, options)}}
+                />
+            );
         }
 
         return <div/>;