WPMU DEV - Beehive Pro (Google Analytics +) 3.4.17

- Enhance: Update external libraries.
- Enhance: WP 5.8 support.
- Fix: Subdirectory subsite post statistics are empty.
- Fix: Invalid API credentials are being used on multisite.

Enhance: Update links to wpmudev.com.
Fix: Tutorials are not loading.
Fix: Submodule is not initialized.

New: Realtime visitors statistics.
Enhance: Improve whitelabel support.
Enhance: Hide irrelevant settings in network admin.
Enhance: Improvements in Exclude Roles settings.
Enhance: Improve GTM container ID validation.
Fix: Scroll bar is hidden after closing onboarding modal.
Fix: Wrong redirect URL after Google authentication.
Fix: Menu item is missing in mobile.
Fix: Ajax form submits are not triggering GTM events.