Major redo with respect to chats/contacts -- read desc

Waiting for chats & contacts is hella unreliable, so I've put them as events
1. receive chats via the `chats-received` event. If new chats are found, the flag for that is sent as well
2. receive contacts via the `contacts-received` event
3. When WA sends older messages, the `chats-update` or `chat-update` event is triggered
4. Baileys keeps track of all the changed conversations between connects

Connects almost always take less than 10 seconds!

src/WAConnection/0.Base.ts

@@ -32,7 +32,7 @@ const logger = pino({ prettyPrint: { levelFirst: true, ignore: 'hostname', trans
 
 export class WAConnection extends EventEmitter {
     /** The version of WhatsApp Web we're telling the servers we are */
-    version: [number, number, number] = [2, 2045, 15]
+    version: [number, number, number] = [2, 2045, 19]
     /** The Browser we're telling the WhatsApp Web servers we are */
     browserDescription: [string, string, string] = Utils.Browsers.baileys ('Chrome')
     /** Metadata like WhatsApp id, name set on WhatsApp etc. */
@@ -43,9 +43,9 @@ export class WAConnection extends EventEmitter {
     state: WAConnectionState = 'close'
     connectOptions: WAConnectOptions = {
         regenerateQRIntervalMs: 30_000,
-        maxIdleTimeMs: 40_000,
+        maxIdleTimeMs: 15_000,
         waitOnlyForLastMessage: false,
-        waitForChats: true,
+        waitForChats: false,
         maxRetries: 10,
         connectCooldownMs: 4000,
         phoneResponseTime: 15_000,
@@ -67,6 +67,7 @@ export class WAConnection extends EventEmitter {
     maxCachedMessages = 50
     loadProfilePicturesForChatsAutomatically = true
 
+    lastChatsReceived: Date
     chats = new KeyedDB (Utils.waChatKey(false), value => value.jid)
     contacts: { [k: string]: WAContact } = {}