This adds "pewdiepie" to the list of banned words because
"subscribe to pewdiepie" is semi-common spam in the Tavern,
and because there is sometimes hate speech in the YouTube
channel and in some material posted by pewdiepie's fans.
This is because they're causing problems in housework guilds (alcohol
is used for cleaning) and since it's coming up to Christmas a lot of
guilds are starting to have permissible conversations about drinks,
rum balls, etc.
We might put these back after Christmas but make specific exceptions
for the housework guilds.
When a more advanced word blocker is introduced, we'll be able to
ban alcohol words only in the Tavern. For irony.
* Added block when user types a swear word listed in banned words
* Moved banned words check to server
* Removed unused code
* Moved banned words to separate file and fixed grammar.
* Updated chat test
* Changed error to BadRequest
* Fixed regex matching
* Updated test banned word
* Moved banned words and cached regex
* Updated banned word message
* Add ban filter only for tavern
* Added tavern id constant
* Added more tests for banned words
* Added warning to banned words
* Added alert
* Added new regex to capture markdown
* Fixed lint, spelling and importing
