Merge branch 'hotfix/4.0.2-fix-build'
fix(docs/api/qq.jmd): docs site is not rendered
doc(endpoint_handlers/traditional.jmd): wrong blog post [skip ci]
fix(client/js/image.js) fixes #1032 TypeError on invalid preview container type
fix(client/js/*) fixes #1031 dependency on Fine Uploader UI from within DnD module
chore(*): Prepare for 4.0.3 hotfix release

[skip ci]
Merge branch 'hotfix/4.0.3'
Merge remote-tracking branch 'origin/master'
docs(features/delete.jmd): Wrong information in DELETE feature docs [skip ci]
docs($support): Mention support ticket option

[skip ci]
fixed merge to develop branch
support for nested dropzones