Fix: Issue with Advanced Targeting Conditions for logged out users.
Fix: Corrected activation routine issues that could prevent version number storage.

Improvement: Added alignment option.
Improvement: Updated for full Popup Maker v1.7 support.
- Leveraged the new AssetCache reducing the need to load an extra JS file for this extension.
- Class auto loading & more reliable upgrade routines.
- Upgrade routines.

Feature: New Idle Time trigger added.
Feature: Added the countdown timer shortcode to the PM Shortcode Builder
Improvement: Moved all code to use PUM-SDK v2.0
Tweak: Removed the Secure Idle User Logout meta box in favor of using existing Shortcode & Trigger APIs.