add config option ignoreConfirmCancel to allow canceling changed dialogs without a prompt.
from patch comment https://dev.ckeditor.com/ticket/10028#comment:4 by Helmø
Fixes for syntax, comment in config.js file and editor.config.ignoreConfirmCancel moved in plugin.js.
Change default value from true to false and fix md.
Moved config variable to dialog plugin file.
Changed config variable name from ignoreConfirmCancel to dialog_noConfirmCancel.
Minor doc str fixes.
Changelog entry.
Merge branch 't/10028' into major