Comments: Added wysiwyg link selector, updated tests, removed command

- Updated existing tests with recent back-end changes, mainly to use
  HTML data.
- Removed old comment regen command that's no longer required.

app/Console/Commands/RegenerateCommentContentCommand.php

@@ -1,49 +0,0 @@
-<?php
-
-namespace BookStack\Console\Commands;
-
-use BookStack\Activity\CommentRepo;
-use BookStack\Activity\Models\Comment;
-use Illuminate\Console\Command;
-use Illuminate\Support\Facades\DB;
-
-class RegenerateCommentContentCommand extends Command
-{
-    /**
-     * The name and signature of the console command.
-     *
-     * @var string
-     */
-    protected $signature = 'bookstack:regenerate-comment-content
-                            {--database= : The database connection to use}';
-
-    /**
-     * The console command description.
-     *
-     * @var string
-     */
-    protected $description = 'Regenerate the stored HTML of all comments';
-
-    /**
-     * Execute the console command.
-     */
-    public function handle(CommentRepo $commentRepo): int
-    {
-        $connection = DB::getDefaultConnection();
-        if ($this->option('database') !== null) {
-            DB::setDefaultConnection($this->option('database'));
-        }
-
-        Comment::query()->chunk(100, function ($comments) use ($commentRepo) {
-            foreach ($comments as $comment) {
-                $comment->html = $commentRepo->commentToHtml($comment->text);
-                $comment->save();
-            }
-        });
-
-        DB::setDefaultConnection($connection);
-        $this->comment('Comment HTML content has been regenerated');
-
-        return 0;
-    }
-}