* add ClientOptions#disableMentions and MessageOptions#disableMentions
* provide tests
* don't sanitize controlled mentions
* add @here mentions to tests
* fix indents (6 spaces instead of 8)
* add Util#cleanContent tests
* add typings for removeMentions
* replace @ with @\u200b AFTER cleaning content as suggested instead of using removeMentions
* better explanation of this option
* no newline in Util.removeMentions
* fix long line
* remove double space
* remove comments (change has been reverted)
* Use Util.removeMentions to remove mentions
* use Util.removeMentions in Util.cleanContent
