feat: replace disableEveryone with disableMentions (#3830)

* 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

src/structures/interfaces/TextBasedChannel.js

@@ -57,8 +57,8 @@ class TextBasedChannel {
    * @property {string} [content=''] The content for the message
    * @property {MessageEmbed|Object} [embed] An embed for the message
    * (see [here](https://discordapp.com/developers/docs/resources/channel#embed-object) for more details)
-   * @property {boolean} [disableEveryone=this.client.options.disableEveryone] Whether or not @everyone and @here
-   * should be replaced with plain-text
+   * @property {boolean} [disableMentions=this.client.options.disableMentions] Whether or not a zero width space
+   * should be placed after every @ character to prevent unexpected mentions
    * @property {FileOptions[]|BufferResolvable[]} [files] Files to send with the message
    * @property {string|boolean} [code] Language for optional codeblock formatting to apply
    * @property {boolean|SplitOptions} [split=false] Whether or not the message should be split into multiple messages if