feat: disable / enable WA Web features (#543)

* Added Features and Enabling/Disabling of Features within WhatsappWeb

* remove feature commands from example

Co-authored-by: Pedro S. Lopez <pslamoros@hotmail.com>
Co-authored-by: Pedro Lopez <pedroslopez@me.com>

example.js

@@ -192,7 +192,7 @@ client.on('message', async msg => {
         const chat = await msg.getChat();
         // stops typing or recording in the chat
         chat.clearState();
-    } else if (msg.body === 'jumpto') {
+    } else if (msg.body === '!jumpto') {
         if (msg.hasQuotedMsg) {
             const quotedMsg = await msg.getQuotedMessage();
             client.interface.openChatWindowAt(quotedMsg.id._serialized);