Customizer Theme Switcher

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This plugin is a WordPress core feature-plugin proposed for WordPress 4.2. The goal is to bring theme-browsing and theme-switching into the Customizer to streamline the themes experience. The current status is extremely basic code-wise, but implements most of what’s available on the themes admin page. See our posts on Make WordPress Core for more info. If you’re interested in contributing to this project, ping @celloexpressions on WordPress core Slack. Core Merge Notes = UX = * Remove #customize-info for theme previews. * Change front-end admin bar Themes link to point to themes in the Customizer (deep-linked). * When a new theme is activated, go to the home page (front end), not the themes admin. * If user doesn’t confirm that they want to leave unsaved changes, remove customize-loading body class (requires core patch). Code See inline comments. Move custom section and control to class-wp-customize-control|section.php in wp-includes. Merge all CSS into customize-controls.css, scope to .wp-customizer. Move .themes-panel-back to the Customizer header, adjust JS accordingly. Merge JS into customizer-controls.js, after the respective object types. Merge remaining PHP (all in Customize Register callback) into register_controls() in class-wp-customize-manager.php. Account for https://core.trac.wordpress.org/ticket/26611