Introduce GDPR compliance assistance

• New: Introduced features to allow users to more easily comply with GDPR rules. Those features include a way for your contacts to view the data that is stored on them in WP-CRM System, the ability for your contacts to export that data, and the ability for contacts to request that their data be deleted. This plugin by itself does not guarantee GDPR compliance.
• Change: register taxonomies on the plugins_loaded action rather than init as was done previously. This allows taxonomies to be exported in reports since the export is done around the setup_theme hook, which takes place prior to init.