Mass Messaging campaign via CSV import

Features

Added Mass messaging campaign via CSV Import
Added Support of template variables in CSV Import campaigns
Visual indication (in Timelines chat view) for messages sent via mass sending campaign

Changes and restrictions

Sending quota enforced for all types of campaigns (Bulk Reply, CSV Import).
File size restricted to 1.5 Mb for all types of mass sending campaigns
Sending interval increased to 10 seconds for all types of mass sending campaigns to improve deliverability

Improvements

Improved delivery of messages to connected sessions (WhatsApp Web, WhatsApp Desktop)
Support for receiving very large attachments

Bugfixes and

Solved problem with sending messages to new chat stuck on “Waiting for this message…” at recipient’s Whatsapp App or Web / Desktop sessions