Resource manager refactoring (wip)
Added pre-fetch directory capability
Improved event debugging
Fixed creation forms
Fixed directory id initialization
Added blacklist/whitelist feature
Simplified parameter name
Added upgrade instructions file
Fixed wrong event attribute bug
Persist picker current directory in session
Fixed deletion bug
Removed outdated files
Updated changelog
Merge branch '3.0-dev' into resource-manager

Conflicts:
	Controller/ResourceController.php
	Controller/ResourcePropertiesController.php
	Repository/ResourceQueryBuilder.php
	Resources/public/js/resource/manager.js
	Resources/translations/platform.en.yml
	Resources/views/layout.html.twig
Fixed resource picker
Added directory pre-fetching of in picker mode
Removed debug statement
Merge branch '3.0-dev' into resource-manager
Added missing use statement
Avoid resource opening in picker mode