This changes the global `$wp_post_types` to an array of `WP_Post_Type` objects. `WP_Post_Type` includes methods to handle post type supports, rewrite rules, meta boxes, hooks, and taxonomies.
Each post type argument becomes a property of `WP_Post_Type`.
Props swissspidy, flixos90.
Fixes#36217.
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git-svn-id: http://core.svn.wordpress.org/trunk@37831 1a063a9b-81f0-0310-95a4-ce76da25c4cd