Requests for comment/Regex-based blacklist

We need a proper blacklist system to merge the current mishmash and implement much-need features.


 * Features
 * Needs to have global (Meta) versions and local versions
 * Needs local whitelists
 * Needs automatic logging
 * Needs a regex checkbox (yes / no)
 * Needs to be able to specify where to apply (page text, edit summaries, log summaries, etc.)
 * Perhaps also be able to specify only certain namespaces?
 * Needs to validate to ensure proper regexes are input
 * Needs to have safety check to ensure we don't ban all normal spaces or the letter K or whatever from page titles
 * Needs Unicode normalization
 * Needs friendly output mode for non-WMF wikis using the list
 * Needs to warn sysops, but be overrideable upon confirmation
 * URL parameterization
 * Forgot why this is important at the moment, but it's in my notes


 * Deprecate
 * Usernameblacklist
 * Titleblacklist (affects, page move, creation, upload, new users)
 * Bad image list
 * Spam blacklist


 * Related bugs
 * 16717