Add namespaces via `upgrade-code add-namespace` tool

Running this command for each directory in the `src` folder we generate a
valid `.upgrade.yml` which can be used by other modules that may use this
one as a dependency to upgrade themselves without issue.

.upgrade.yml

@@ -0,0 +1,10 @@
+mappings:
+  CMSExternalLinks_Controller: SilverStripe\ExternalLinks\Controllers\CMSExternalLinks_Controller
+  CheckExternalLinksJob: SilverStripe\ExternalLinks\Jobs\CheckExternalLinksJob
+  BrokenExternalLink: SilverStripe\ExternalLinks\Model\BrokenExternalLink
+  BrokenExternalPageTrack: SilverStripe\ExternalLinks\Model\BrokenExternalPageTrack
+  BrokenExternalPageTrackStatus: SilverStripe\ExternalLinks\Model\BrokenExternalPageTrackStatus
+  BrokenExternalLinksReport: SilverStripe\ExternalLinks\Reports\BrokenExternalLinksReport
+  CheckExternalLinksTask: SilverStripe\ExternalLinks\Tasks\CheckExternalLinksTask
+  CurlLinkChecker: SilverStripe\ExternalLinks\Tasks\CurlLinkChecker
+  LinkChecker: SilverStripe\ExternalLinks\Tasks\LinkChecker

src/Controllers/CMSExternalLinks.php

@@ -1,5 +1,14 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Controllers;
+
+use Controller;
+use HTTP;
+use BrokenExternalPageTrackStatus;
+use CheckExternalLinksJob;
+use CheckExternalLinksTask;
+
+
 class CMSExternalLinks_Controller extends Controller {
 
 	private static $allowed_actions = array('getJobStatus', 'start');

src/Jobs/CheckExternalLinksJob.php

@@ -1,5 +1,12 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Jobs;
+
+use AbstractQueuedJob;
+use QueuedJob;
+use CheckExternalLinksTask;
+
+
 if(!class_exists('AbstractQueuedJob')) return;
 
 /**

src/Model/BrokenExternalLink.php

@@ -1,5 +1,13 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Model;
+
+use DataObject;
+use Member;
+use Permission;
+use Config;
+
+
 /**
  * Represents a single link checked for a single run that is broken
  *

src/Model/BrokenExternalPageTrack.php

@@ -1,5 +1,11 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Model;
+
+use DataObject;
+use Versioned;
+
+
 /**
  * Represents a track for a single page
  */

src/Model/BrokenExternalPageTrackStatus.php

@@ -1,5 +1,11 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Model;
+
+use DataObject;
+use Versioned;
+
+
 /**
  * Represents the status of a track run
  *

src/Reports/BrokenExternalLinksReport.php

@@ -1,5 +1,15 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Reports;
+
+use SS_Report;
+use Convert;
+use BrokenExternalPageTrackStatus;
+use ArrayList;
+use Requirements;
+use LiteralField;
+
+
 /**
  * Content side-report listing pages with external broken links
  * @package externallinks

src/Tasks/CheckExternalLinksTask.php

@@ -1,5 +1,18 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Tasks;
+
+use BuildTask;
+use Debug;
+use BrokenExternalPageTrack;
+use DOMNode;
+use BrokenExternalLink;
+use Config;
+use BrokenExternalPageTrackStatus;
+use Injector;
+use DB;
+
+
 class CheckExternalLinksTask extends BuildTask {
 
 	private static $dependencies = array(

src/Tasks/CurlLinkChecker.php

@@ -1,5 +1,10 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Tasks;
+
+use SS_Cache;
+
+
 /**
  * Check links using curl
  */

src/Tasks/LinkChecker.php

@@ -1,5 +1,10 @@
 <?php
 
+namespace SilverStripe\ExternalLinks\Tasks;
+
+
+
+
 /**
  * Provides an interface for checking that a link is valid
  */