Add 'Move Posts to Forum' Functionality to One-Click Ban

[JediFreeman]

This adds a "Move Posts to Forum" action to the One-Click Ban system. The code for moving the posts was extracted from the default phpBB code under the Manage Users ACP page ( includes/acp/acp_users.php under case 'moveposts' ).

The purpose for this is for being able to archive banned user posts in a "trash bin" forum for reference before deleting them at a later time.

[EXreaction]

This looks good, the only two things besides the note I made about coding guidelines is that asacp_ocban_move_posts_to_forum needs to be added to the installer, antispam/asacp_versions.php, and a note of the addition should be in the history in install.xml.

Create a new version of 1.0.6-dev if necessary.

After that I think this can be merged, thanks :)