Issue #1950634 by Wim Leers: Fatal error when creating a new text format with a text editor while JS is disabled.

Issue #2011998 by David_Rothstein: String-parsing in hook_custom_theme() should be replaced with theme callbacks (for now).

Issue #1943624 by joelpittet, Berdir, Wim Leers, xjm: Fixed EntityMalformedException when enabling a text editor while creating a new text format, because Editor depends on FilterFormat.

Issue #1886566 by Wim Leers, sun, effulgentsia, quicksketch: Make WYSIWYG editors available for in-place editing.

Issue #1890502 by Wim Leers, quicksketch, jessebeach, nod_, sun, effulgentsia: Added CKEditor module to core.

Issue #1833716 by quicksketch, Wim Leers, sun, TwoD: Added WYSIWYG: Introduce 'Text editors' as part of filter format configuration.

Revert "Issue #1833716 by quicksketch, Wim Leers, effulgentsia: added WYSIWYG: Introduce 'Text editors' as part of filter format configuration."

Fixing commit credit.

This reverts commit ee1b6de6.

Issue #1833716 by quicksketch, Wim Leers, effulgentsia: added WYSIWYG: Introduce 'Text editors' as part of filter format configuration.