Add option to group messages about tedicross

[rraallvv]

@trgwii Yes, sure 👍

[Suppen]

Discord messages might break the grouping only at the change of hour. https://www.reddit.com/r/discordapp/comments/5dr2a4/when_does_discord_separate_messages/

More testing to determine when grouping breaks must be done

[Suppen]

This has been slightly improved in commit 42d4812
It now says

username:
message
username
message

[rraallvv]

I solved this keeping track of the user ID in the last message. Is not an elegant solution though, I added a setter to the class Bridge to check whether the user is different from the previous and to set a flag I use then to know whether to show the user or not in the next message.

class Bridge {
	set lastUserId(id) {
		if (this._lastUserId !== id) {
			this._lastUserId = id;
			this._showUsername = true;
		}
	}

	get showUsername() {
			return this._showUsername;
	}
}

The in discord to telegram

let textToSend;
if (bridge.discord.sendUsernames && bridge.showUsername) {
	textToSend = `<b>${senderName}</b>\n${processedMessage}`;
} else {
	textToSend = processedMessage;
}

// Disable showing the user name for the same user in the next message
bridge.showUsername = false;

And telegram to discord

let messageText;
if (!bridge.telegram.sendUsernames || messageObj.reply !== null || !bridge.showUsername) {
	messageText = messageObj.text;
} else {
	messageText = `**${messageObj.from}**\n${messageObj.text}`;
}

// Disable showing the user name for the same user in the next message
bridge.showUsername = false;

[trgwii]

Can you do a PR?