feat: reimplement disableEveryone into disableMentions

* User input sanitation: reimplement disableEveryone into disableMentions

* Change default value of ClientOptions#disableMentions to 'none'

* Update type declarations of disableMentions to include default

* update for compliance with ESLint

* Overlooked these files. Updated for complete compliance with ESLint

src/util/Constants.js

@@ -21,7 +21,8 @@ const browser = exports.browser = typeof window !== 'undefined';
  * the message cache lifetime (in seconds, 0 for never)
  * @property {boolean} [fetchAllMembers=false] Whether to cache all guild members and users upon startup, as well as
  * upon joining a guild (should be avoided whenever possible)
- * @property {boolean} [disableMentions=false] Default value for {@link MessageOptions#disableMentions}
+ * @property {'none' | 'all' | 'everyone'} [disableMentions='none'] Default value
+ * for {@link MessageOptions#disableMentions}
  * @property {PartialType[]} [partials] Structures allowed to be partial. This means events can be emitted even when
  * they're missing all the data for a particular structure. See the "Partials" topic listed in the sidebar for some
  * important usage information, as partials require you to put checks in place when handling data.
@@ -47,7 +48,7 @@ exports.DefaultOptions = {
   messageCacheLifetime: 0,
   messageSweepInterval: 0,
   fetchAllMembers: false,
-  disableMentions: false,
+  disableMentions: 'none',
   partials: [],
   restWsBridgeTimeout: 5000,
   disabledEvents: [],