Add a 'child_type' parameter to mb_dropdown_forums().  This is so that we know to only disable forums if they don't allow topics.  We don't need to disable forum children.
Create separate `load-post.php` files for each post type and handle the particular post type only in that file. Clean up the meta boxes.
Rename edit posts screen files.
Remove filter on forum rewrite rules since we were not using it.
Add some fixes for basic search.
More query cleanup. Move some conditional functions to their proper files.
Introduce getter functions with filter hooks for the post statuses used in the plugin.
Major overhaul and beefing up of post status functionality. Lots of nifty new functions added.
Introduce the mb_insert_topic() function and related changes.
Move post type name getter functions to functions-post-types.php, apply filters to post type args, and custom text for "enter title here" for forums.