Require inclusion of contao core and event-dispatcher config.php before ourselves.
Drop deprecated class ContaoController from MetaModels\Filter\Setting\Simple.
phpDoc.
Refactor tl_metamodel_dca.isclosed => iseditable,iscreatable,isdeleteable.

The old isclosed is way to limited for DCG 2.0 and will get phased out.
The new methods are:
IInputScreen::isEditable()
IInputScreen::isCreatable()
IInputScreen::isDeletable()
Fix typo: isdeletable => isdeleteable.
Add new fields for tl_metamodel_dca and add upgrade wizard for them.
Implement parsing of default sorting and grouping for InputScreen.
Correct parsing of sort panel.
Move sorting and grouping related fields into own sub table.
Refactor UpgradeHandler to populate new subtable.
Refactor Builder to use new sort and grouping.
Change event handlers.
Merge branch 'tng' into rework-sorting
Add check if table is present as otherwise the runonce upgrade can not run.
Merge branch 'tng' into rework-sorting

Conflicts:
	contao/config/config.php
	src/MetaModels/BackendIntegration/Boot.php
	src/MetaModels/BackendIntegration/InputScreen/IInputScreen.php
	src/MetaModels/BackendIntegration/InputScreen/InputScreen.php
	src/MetaModels/BackendIntegration/ViewCombinations.php
	src/MetaModels/DcGeneral/Dca/Builder/Builder.php
	src/MetaModels/DcGeneral/Events/Subscriber.php
	src/MetaModels/Filter/Setting/Simple.php
	src/MetaModels/Helper/UpgradeHandler.php
	contao/dca/tl_metamodel_dca.php
Merge branch 'tng' into rework-sorting
Merge branch 'tng' into rework-sorting
Merge branch 'tng' into rework-sorting
Merge branch 'tng' into rework-sorting
Merge branch 'tng' into rework-sorting