Issue: Move Wiki BB-Codes to New Table

Due to continued issues users are having with BB-Codes not falling back, this needs to be given sooner attention.

With the XenForo behavior emulating the vBulletin behavior in XF 1.3+, it makes little sense to add an extra query to vBulletin when a query can be reduced in XenForo.

Further, it seems that the entirety of the Syntax Manager can be removed for XenForo, since the BB-Code Manager uses DMs and provides an extensible interface. vBulletin now deserves a second look to see if Syntax Manager can be merged with their BB-Code Manager, even if the coding would be extremely convoluted.

This has been moved forward to be addressed before a stable release. Because in fact, the wiki BB-Codes need to be more abstract than they already are.

The problem we have faced historically is BB-Code name conflicts:
- [TABLE] tag. Other mods added one. vBulletin 4.1.4 added one.
- [H] tag. vBulletin 4.1.4 added one.
- [HR] tag. vBulletin 4.1.4 added one.
- [GALLERY] tag. Other mods added one. XenForo now adds one in an official add-on.

Because multiple variants of many tags are actually useful (e.g. VaultWiki's GALLERY tag performs a different function than XenForo's), it is preferable to be able to rename tags at will without disturbing the function that the tag performs. This requires a second unique key to identify tags rather than the user-facing tag name.

Abstracting BB-Codes in this way has turned out to be quite a project, since the tag names are hard-coded in many places for many different purposes. Most of the work is done as of this afternoon, with the following exceptions:

- Update the importer to capture renamed tags from the source db and map them to renamed tags in the target db when converting text content.
- Update the importer to capture the new prefix-tag variant.
- Update Special:WikiCodeList FAQ entries to the new names.
- Update the install/upgrade system to add BB-Codes via custom XML, so that the BB-Code install process can use the same source data cross-platform, and so these tags are auto-renamed during installation if the names are already in use.

This work is expected to be complete by 4.0.6.

This change is completed in the next release. It should now be possible to change the tags for VaultWiki BB-Codes. For example, you can use another mod's GALLERY or TABLE while renaming the VaultWiki tags to GALLERY_WIKI and TABLE_WIKI (or whatever you want to name them), so you can still use both versions of the tags.

Note: It is not recommended to rename any tags after you have used them for a while, because existing text cannot be updated automatically -- there is no way to know whether the usage is for another mod's tag or VaultWiki's tag without human review of the usage.