Update cabinet/index.php template.
Update talk/view.php template.
Update user/index.php template.
Update docs/install-vkclone.md.
Create DefaultController in Forums module.
Add 3 topics lists in Forums.

Added lists:
- New messages (recently updated topics)
- My messages (topics I participated ordered by last post datetime)
- My topics (topics I created ordered by last post datetime)
Add number of forum topics to the user's page.
Update SortableModel extension.
Update forum/index.php template.