XWIKI-19928: Migrate CKEditor to XWiki Platform

pom.xml

xwiki-platform-core/pom.xml

...-platform-annotation/xwiki-platform-annotation-ui/pom.xml

...chment-picker/xwiki-platform-attachment-picker-ui/pom.xml

xwiki-platform-core/xwiki-platform-ckeditor/.gitignore

xwiki-platform-core/xwiki-platform-ckeditor/Jenkinsfile

xwiki-platform-core/xwiki-platform-ckeditor/README.md

...ki-platform-ckeditor/application-ckeditor-runtime/pom.xml

xwiki-platform-core/xwiki-platform-ckeditor/pom.xml

...ki-platform-ckeditor/xwiki-platform-ckeditor-base/pom.xml

...ki-platform-ckeditor-base/src/main/config/build-config.js

...platform-ckeditor/xwiki-platform-ckeditor-plugins/pom.xml

...ckeditor-plugins/src/main/resources/xwiki-cache/plugin.js

...keditor-plugins/src/main/resources/xwiki-config/plugin.js

...ckeditor-plugins/src/main/resources/xwiki-dialog/modal.js

...keditor-plugins/src/main/resources/xwiki-dialog/plugin.js

...keditor-plugins/src/main/resources/xwiki-filter/plugin.js

...itor-plugins/src/main/resources/xwiki-image-old/plugin.js

...tor-plugins/src/main/resources/xwiki-image/imageEditor.js

...r-plugins/src/main/resources/xwiki-image/imageSelector.js