Issue #2888723 by fenstrat, Petr Illek, kim.pepper, johnennew, Wim Leers,...

Issue #2888723 by fenstrat, Petr Illek, kim.pepper, johnennew, Wim Leers, alexpott: ckeditor_stylesheets cache busting: use system.css_js_query_string

Closes #3365251

changed target branch from master to 1.0.x

added 3 commits

• cd0f4459...ca8db1e5 - 2 commits from branch project:1.0.x
• 34a7edcf - Issue #3365251: Resolved merge conflicts with '1.0.x'.

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