Use messenger.com URLs instead of facebook.com

This should allow people who have only created a messenger account to
log in.

Also parse required `fb_dtsg` and `client_revision` values better.

The 2-fa flow is removed for now, I'll re-add it later.

fbchat/_client.py

@@ -524,7 +524,9 @@ def upload(
         data = {"voice_clip": voice_clip}
 
         j = self.session._payload_post(
-            "https://upload.facebook.com/ajax/mercury/upload.php", data, files=file_dict
+            "https://upload.messenger.com/ajax/mercury/upload.php",
+            data,
+            files=file_dict,
         )
 
         if len(j["metadata"]) != len(file_dict):

fbchat/_listen.py

@@ -8,7 +8,7 @@
 from typing import Iterable, Optional, Mapping, List
 
 
-HOST = "edge-chat.facebook.com"
+HOST = "edge-chat.messenger.com"
 
 TOPICS = [
     # Things that happen in chats (e.g. messages)
@@ -271,10 +271,10 @@ def _configure_connect_options(self):
 
         headers = {
             "Cookie": get_cookie_header(
-                self.session._session, "https://edge-chat.facebook.com/chat"
+                self.session._session, "https://edge-chat.messenger.com/chat"
             ),
             "User-Agent": self.session._session.headers["User-Agent"],
-            "Origin": "https://www.facebook.com",
+            "Origin": "https://www.messenger.com",
             "Host": HOST,
         }