Bump to `2.14.0` - fixes issues related to `m4a` files.

Fixes #27570.


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When creating a new playlist, we don't know from the model what "type" it is right away (there is no longer a `video-playlist` shortcode) - we need to check the controller's library's prop for `type` when deciding what settings to display in the modal.

See #27535.


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Return the default mime icon for playlist items that don't have a featured image in `wp_prepare_attachment_for_js()`.

See [27640].


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Widget Customizer: Set hightlight color to blue. Same color as in [27741].

fixes #27358.
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Introduce `pre_update_option` filter.

Filter is available in update_option() and allows to filter any option before its value is (maybe) serialized and updated.

see #27504.
props westonruter.

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Widget Customizer: Convert static WP_Customize_Widgets class into instantiated class and merge Options_Transaction into WP_Customize_Widgets.

see #27504.
props westonruter.

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MediaElement.js: Update version for [27811]. see #27570.
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Widget Customizer: Remove `UPDATE_WIDGET_AJAX_ACTION` and `UPDATE_WIDGET_NONCE_POST_KEY` constants.

see #27534.
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Widget Customizer: Simplify nonces.

see #27534.
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Widget Customizer: Simplify conditions in setup_widget_addition_previews().

see #27534.
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Allow the fullscreen editor's content area to also be responsive. props avryl. fixes #27569.

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Install: Allow an installation to go through with a custom user table with the username 'admin'.

This could be better, but this solves the regression caused by [25115].

fixes #27093, see #24078.

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The `sidebar_admin_setup` hook should only be documented once in wp-admin/widgets.php. All others are duplicates.

See #25374, #25501, #27531.

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Widget Customizer: Remove some specific styles for Widget Visibility from Jetpack.

This hasn't worked well and is now fixed upstream.

props westonruter.
see #27112.

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Inline documentation for hooks in wp-includes/pluggable.php.

Props kpdesign for some cleanup.
Fixes #26888.

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Inline documentation for hooks in wp-includes/class.wp-styles.php.

Props lkwdwrd.
Fixes #27445.

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Inline documentation for hooks in wp-includes/taxonomy.php.

Props kpdesign for some minor language tweaks.
Fixes #27505.

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Inline documentation for hooks in wp-includes/class-wp-editor.php.

Props kpdesign for some cleanup.
Fixes #27523.

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Updated `2.14.0` build from the project maintainer.

See #27570.


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Theme Installer: Caching and paginating of API requests.

props matveb.
see #27055.

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