Bundled Themes: Expand initial block editor support.
A handful of items were missed when adding initial support for the new block editor to bundled themes in [43793]-[43800]. This adds support for those missed items.
Props pento, davidakennedy, laurelfulford.
Merges [43869], [43870], [43871], [43872], [43873], [43874], [43875], [43876] to trunk.
Fixes #45238, #45239, #45240, #45242, #45243, #45244, #45245, #45246.
Built from https://develop.svn.wordpress.org/trunk@44152
git-svn-id: http://core.svn.wordpress.org/trunk@43982 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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