Edit filter configuration

Checks for misuse of Unicode Mathematical Alphanumeric Symbols in usernames. This is generally used to create "stylish" usernames that appear to be in bold type or italics  resulting in accidental obfuscation, but can also be used for deliberate obfuscation.

Added a second range, Letterlike Symbols.

Wow -- false positives. Disabling blocking. Removing Kelvin symbol; looks like Unicode normalization might have turned this into an ASCII K

Provoked a hit here: https://en.wikipedia.org/wiki/Special:AbuseLog/31016167 , seems to be working OK, no false positives for some time, presumed working properly now.

Same thing seems to have happened to the Angstrom symbol being normalized to CAPITAL A WITH RING ABOVE; removing that too.

Added another set of lookalikes from the Phonetic Extensions range.

27 November -- all working fine, zero false positives

Removed U+2126 OHM SIGN, which was being normalized to an Omega thus generating false positives.

Use \x{...} instead of literal characters; should be easier to edit the filter. --Suffusion of Yellow 21:10 13 Jun 2022

Now enabling on _all_ actions, not just account creation, as vandals have recently been circumventing this filter by (presumably) creating the accounts on other Wikipedia sites, then editing here. See [[User:𝕮𝖍𝖆𝖗𝖑𝖎𝖊(WCF)]] and [[User:ℙ𝕪𝕣𝕒𝕃𝕒𝕓𝕤]] for examples of this. -- The Anome 12 Aug 2022

Now allowing account creation, but not allowing them to do anything else. -- The Anome 27 September 2022

Same intent as above, but more futureproof logic. Any action with "account" in it is permitted, but no other -- The Anome 9 Oct 2022

Turned this into a test filter; why is this not catching my test edits? -- The Anome 19 Oct

Rm T230256 workaround. --Suffusion of Yellow 00:01 4 Dec 2022

Now logging edit attempts by these accounts. -- The Anome 13 Feb 2023