Emoji convenience methods (#1378)

* make branch

* stuff

* Consistency & remove role(s)

* kill me

* Doc changes

Requested by Crawl

* forgot 1

src/structures/Emoji.js

@@ -123,6 +123,59 @@ class Emoji {
     return this.client.rest.methods.updateEmoji(this, data);
   }
 
+  /**
+   * Set the name of the emoji.
+   * @param {string} name The new name for the emoji
+   * @returns {Promise<Emoji>}
+   */
+  setName(name) {
+    return this.edit({ name });
+  }
+
+  /**
+   * Add a role to the list of roles that can use this emoji.
+   * @param {Role} role The role to add
+   * @returns {Promise<Emoji>}
+   */
+  addRestrictedRole(role) {
+    return this.addRestrictedRoles([role]);
+  }
+
+  /**
+   * Add multiple roles to the list of roles that can use this emoji.
+   * @param {Role[]} roles Roles to add
+   * @returns {Promise<Emoji>}
+   */
+  addRestrictedRoles(roles) {
+    const newRoles = new Collection(this.roles);
+    for (const role of roles) {
+      if (this.guild.roles.has(role.id)) newRoles.set(role.id, role);
+    }
+    return this.edit({ roles: newRoles });
+  }
+
+  /**
+   * Remove a role from the list of roles that can use this emoji.
+   * @param {Role} role The role to remove
+   * @returns {Promise<Emoji>}
+   */
+  removeRestrictedRole(role) {
+    return this.removeRestrictedRoles([role]);
+  }
+
+  /**
+   * Remove multiple roles from the list of roles that can use this emoji.
+   * @param {Role[]} roles Roles to remove
+   * @returns {Promise<Emoji>}
+   */
+  removeRestrictedRoles(roles) {
+    const newRoles = new Collection(this.roles);
+    for (const role of roles) {
+      if (newRoles.has(role.id)) newRoles.delete(role.id);
+    }
+    return this.edit({ roles: newRoles });
+  }
+
   /**
    * When concatenated with a string, this automatically returns the emoji mention rather than the object.
    * @returns {string}