Issue #3306630: [PP-1] Split the core 9.5.x ckeditor history into a new 1.0.x branch and cut a 1.0.0 release

Wim Leersrequested to merge
issue/ckeditor-3306630:3306630-after-3306545-ckeditor4-is-no-longer-installed into 1.0.x

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