The Events Calendar - Event Tickets Plus 5.10.1

* Feature - V2 Customizer - Add background color css overrides. [ETP-556]
* Feature - V2 Customizer - Add Event Title color css overrides. [ETP-576]
* Feature - V2 Customizer - Add Event Date & Time color css overrides. [ETP-575]
* Fix - Resolve a potential fatal error when saving a page using the Block Editor that contains the Attendee Registration Page shortcode. [ETP-598]
* Fix - Resolve PHP notices on the Attendee Registration Page from WooCommerce and Easy Digital Commerce ticket details when multiple Commerce Providers may be available. [ETP-599]
* Tweak - Added support for placeholders on the new Meta Field views (v2/components/meta/*.php) and make use of them in Individual Attendee Collection to show "Optional" text when collection is optional. [ETP-577]
* Tweak - Moved ticket editor warnings to Event Tickets. [ET-947]
* Tweak - Add opaque backgrounds for selected bordered elements. [ETP-579]
* Language - 1 new strings added, 8 updated, 0 fuzzied, and 3 obsoleted

* Fix - Resolve notices and fatal errors related to `[tribe_tickets]` shortcode, happening since version 5.1.0.

* Fix - Require Event Tickets 5.0.3+ for compatibility purposes on certain areas Event Tickets Plus that have direct calls to Event Tickets functionality. [ETP-578]