Maintenance Release 6.4.1

• Feature - Add an abstract admin page to start consolidating how we do admin pages. See the "First Time Setup" page (onboarding wizard) for an example. [TEC-5294]
• Tweak - Ensure we are not loading any assets from node_modules. Include anything we need as a 3rd party code in our plugin. [TCMN-175]
• Fix - Cast $block argument to string to avoid PHP 8+ deprecation notice when non string (or array) variables are passed as the 3rd argument of preg_replace.
• Fix - Correctly identify licenses using uplink, like Event Tickets Plus. [n/a]
• Fix - Ensure that number_format is used with a float value to prevent issues with PHP 8.0+. [ETP-962]
• Fix - Ensure we get an object to test for subnav. Pass the object to class filter for more context. [n/a]
• Fix - Prevent fatal on ET integration page when used with Events Pro but without Event Tickets Plus. [TCMN-174]
• Deprecated - Integrations Tab registration in Event Ticket Settings from common. These will be registered from Event Tickets Plus only instead. [TCMN-174]
• Language - 0 new strings added, 33 updated, 1 fuzzied, and 0 obsoleted.