widget side droppable
columns data in widget instance table
remove missleading comment
Merge branch '4.0' of github.com:impresspages/ImpressPages-CMS into feature-drop-aside

Conflicts:
	Ip/Internal/Content/assets/management.min.js
Merge branch '4.0' of github.com:impresspages/ImpressPages-CMS into feature-drop-aside
remove unused code
Merge branch '4.0' of github.com:impresspages/ImpressPages-CMS into feature-drop-aside
Merge branch '4.0' of github.com:impresspages/ImpressPages-CMS into feature-drop-aside
widget drop on side refactoring
Merge branch '4.0' of github.com:impresspages/ImpressPages-CMS into feature-drop-aside
widget side drop placeholder
Merge branch '4.0' of github.com:impresspages/ImpressPages-CMS into feature-drop-aside
widget side drop placeholder
Merge branch '4.0' of github.com:impresspages/ImpressPages-CMS into feature-drop-aside
refactor content service
refactor content service
Merge branch '4.0' of github.com:impresspages/ImpressPages-CMS into 4.0