Jeremy Felt e497698613 Multisite: Introduce the WP_Site class.
* A `WP_Site` object initially matches a row from `wp_blogs`.
* A site can be retrieved by its ID through `WP_Site::get_instance()`.
* Adds `sites` to the global cache group and captures instance lookups.
* The multisite bootstrap now ensures `$current_blog` is an instance of `WP_Site`.

Props johnjamesjacoby, jeremyfelt.
See #32450.


git-svn-id: https://develop.svn.wordpress.org/trunk@36393 602fd350-edb4-49c9-b593-d223f7449a82
2016-01-25 21:51:01 +00:00
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