* Introduces `customize-selective-refresh-widgets` theme support feature and adds to themes.
* Introduces `customize_selective_refresh` arg for `WP_Widget::$widget_options` and adds to all core widgets.
* Remove `selective_refresh` from being a component that can be removed via `customize_loaded_components` filter.
* Add `WP_Customize_Widgets::get_selective_refreshable_widgets()` and `WP_Customize_Widgets::is_widget_selective_refreshable()`.
* Fix default `selector` for `Partial` instances.
* Implement and improve Masronry sidebar refresh logic in Twenty Thirteen and Twenty Fourteen, including preservation of initial widget position after refresh.
* Re-initialize ME.js when refreshing `Twenty_Fourteen_Ephemera_Widget`.
See #27355.
Fixes#35855.
Built from https://develop.svn.wordpress.org/trunk@37040
git-svn-id: http://core.svn.wordpress.org/trunk@37007 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix also removes several `!important` flags that aren't necessary, relating to header text color.
git-svn-id: http://core.svn.wordpress.org/trunk@23492 1a063a9b-81f0-0310-95a4-ce76da25c4cd