Jeremy Felt 1560fbcbc5 Multisite: Use get_network() and get_current_network_id() for current network data.
`get_network()` falls back to the current network when called without any arguments. Between this and `get_current_network_id()`, we can replace almost all instances of the global `$current_site` and all instances of `get_current_site()`.

This effectively deprecates `get_current_site()`, something that we'll do in a future ticket.

Props flixos90.
Fixes #37414.

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git-svn-id: http://core.svn.wordpress.org/trunk@38757 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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