Popup Maker - Advanced Targeting Conditions 1.4.6

* Improvement: Updated usage of core helper functions.
* Improvement: Store page view counts per popup rather than globally.

Fix: Issue with json cookies being read incorrectly

* Feature: New Conditions
* User viewed popup, with optional settings for testing if they viewed it more/less than a specific number.
* Keyboard modifiers allow testing if user was holding ctrl, alt or shift keys.
* 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.
* Autoloader
* Upgrade routines.