TinyMCE: fix editor.css.
- Re-enable the default images for buttons not used in WordPress.
- Remove redundant styles for the old buttons sprite.
Fixes #26294.
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Fix pending comments/plugins count bubbles, fixes #25918
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Core Updates: Fix a case where options (db_version specifically) can end up with stale values in the cache after a update is performed. Fixes #26173 for trunk.

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Fix a regression in wp_mkdir_p() where the $mode of the parent folder is not correctly applied to all created paths. Fixes #25822 for trunk

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Make sure toolbar reset includes text-shadow: none. props kwight. fixes #25260.

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Keep #screen-meta font size consistent. props SergeyBiryukov. fixes #26300.

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Get more specific with responsive list table column hiding. Removes unused styling for the plugins list table. fixes #26298.

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Also get more targeted for taxonomy columns. Consolidate column hiding into one rule. props SergeyBiryukov. fixes #26298.

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Increase the contrast of sidebar text in the media modal. props neil_pie. fixes #26288.

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Add remove_option(), remove_options(), and get_options() methods to WP_Screen, along with unit tests. props ocean90, DrewAPicture. fixes #25799.

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Pass the post type to the `post_type_archive_title` filter for better context. Adds lovely docs. props DrewAPicture. fixes #25605.

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