Move Wiki BB-Codes to New Table
While the wiki BB-Codes were added to vBulletin's 'bbcode' table to gain the 'buttonimage' field and have settable 'vw_options', this is not ideal where the dummy BB-Codes might overwrite default BB-Codes or BB-Codes added in the wrong hook (bbcode_fetch_tags). Instead, the wiki tags should be saved in their own table and merged into the tag_list at run-time after checking for collisions. This design change would have the added effect of matching the XenForo integration for BB-Codes, which would make managing upgrades and other data simpler.