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/util/Util.js

@@ -518,6 +518,15 @@ class Util {
     return dec;
   }
 
+  /**
+   * Breaks user, role and everyone/here mentions by adding a zero width space after every @ character
+   * @param {string} str The string to sanitize
+   * @returns {string}
+   */
+  static removeMentions(str) {
+    return str.replace(/@/g, '@\u200b');
+  }
+
   /**
    * The content to have all mentions replaced by the equivalent text.
    * @param {string} str The string to be converted
@@ -525,8 +534,7 @@ class Util {
    * @returns {string}
    */
   static cleanContent(str, message) {
-    return str
-      .replace(/@(everyone|here)/g, '@\u200b$1')
+    return Util.removeMentions(str
       .replace(/<@!?[0-9]+>/g, input => {
         const id = input.replace(/<|!|>|@/g, '');
         if (message.channel.type === 'dm') {
@@ -550,7 +558,7 @@ class Util {
         if (message.channel.type === 'dm') return input;
         const role = message.guild.roles.cache.get(input.replace(/<|@|>|&/g, ''));
         return role ? `@${role.name}` : input;
-      });
+      }));
   }
 
   /**