The Events Calendar - Event Tickets Plus 6.3.0

* Feature - Introduction of Tickets Commerce, the new and improved solution you can set up to sell tickets with Event Tickets.
* Language - 2 new strings added, 30 updated, 0 fuzzied, and 0 obsoleted

* Tweak - Changed the `provider` URL variable name to `tickets_provider`. The filter `tribe_tickets_get_provider_query_slug` allows for customization. [ET-543]
* Tweak - Added the `isValidForm.eventTicketsModal` JS event to allow for third party plugins to provide their own validation logic. [ETP-752]
* Fix - Removed the ability to resend tickets from the Attendees page to Attendees who cancelled or refunded their ticket. [ETP-703]
* Fix - Fix the inconsistent vertical spacing between attendee registration fields in admin view. [ETP-748]
* Language - 0 new strings added, 23 updated, 0 fuzzied, and 0 obsoleted

* Fix - Fixed cart calculation inconsistency with WooCommerce when the "Number of decimals" setting was set to `0`. [ETP-324]
* Enhancement - Added description field support for Attendee Registration Fields. [ETP-712]
* Enhancement - Updated layout and content for attendee registration fields. [ETP-741]
* Tweak - Added the ability to hide attendee data from public view via the AR Modal. [ETP-127]
* Language - 5 new strings added, 14 updated, 0 fuzzied, and 2 obsoleted