Native v6.0.0

Enables support for the new message/post type introduced in %groups v7.0.0 and fixes several issues.

• Adds support for rich link preview data in Galleries, Chat channels, and DMs
• Adds the ability to mention @all, @admins, and @channel in Chat channels
• Restores pinning/unpinning for DMs and chat channels
• Restores full blocking functionality
• Fixes an issue with inline code blocks rendering additional, unintended text
• Fixes an issue where the toggle to turn off/on telemetry would incorrectly report the user's preference and unmask data sent for product analysis
• Fixes an issue with groups that aren't your personal group being highlighted after onboarding
• Fixes an issue where italics would not display on the iOS app
• Fixes an issue where headers in Notebooks were the wrong font size
• Fixes an issue where emoji reactions would occasionally be missing
• Fixes an issue with the recent protocol upgrade issue that rendered extant group DMs incompatible