BUG: Fix multiple issues with "split" feature

[johnhenley]

Describe the bug

There is a great feature in the Forums module, but it needs some love.
If you add some tokens to the TopicView.ascx template, and you're a moderator, you can split selected replies from a thread into a different thread, in a different or same forum.

Software Versions

• DNN: 09.13.03
• Module: 08.00.01

What needs to be addressed:

1. The [SPLITBUTTONS], [SPLITBUTTONS2], and [SPLITCHECKBOX] need to be in the TopicView template, so they need to be added to the TopicView template shipped with the community-default and community-bootstrap themes.
2. There are some styling issues with how the buttons appear that should be cleaned up (i.e. the 'Save' and 'Cancel' buttons are initially visible but should only show up if you actually click 'Split' :) )
3. An error is displayed when the split is performed, which needs to be diagnosed and fixed.
4. The new (friendly) URL is not created when the new topic thread is created (you have to edit then save the topic, which creates the URL.