Feature: Allow picking of Tree Root (#669)

* include manifest in local variable name

* this is run when the alias is changed

* add manifest to variable

* add TODO

* update tree repo interface to get a tree root

* simplify

* return data type tree root

* add request root method to tree context

* render tree directly in tree menu item

* render root in tree element

* map has children to model

* set root to custom type

* add requestTreeRoot method to all repos that implement a treeRepository

* avalanche of type updates

* allow null (root) in pickers

* allow tree item extension for multiple "entity" types

* get tree root items if getChildren receives null

* add tree root model

* update tree root data

* allow entity action to be applied to multiple entity types

* allow move and copy to root

* selection in picker can include null

* temp typescript fix

* add support for hiding the tree root

* fix file system trees get root items

* clean up

* update move/copy mock db logic

* allow create action on data type root

* restrict data type entity actions on specific entity types

* temp add action to all entities

* temp typescript hack

* Update tree-item.model.ts

---------

Co-authored-by: Nathan Woulfe <nathan@nathanw.com.au>

src/Umbraco.Web.UI.Client/libs/extensions-registry/models/entity-action.model.ts

@@ -47,5 +47,5 @@ export interface MetaEntityAction {
 }
 
 export interface ConditionsEntityAction {
-	entityType: string;
+	entityTypes: Array<string>;
 }

src/Umbraco.Web.UI.Client/libs/extensions-registry/models/tree-item.model.ts

@@ -7,5 +7,5 @@ export interface ManifestTreeItem extends ManifestElement<UmbTreeItemExtensionEl
 }
 
 export interface ConditionsTreeItem {
-	entityType: string;
+	entityTypes: Array<string>;
 }