Move widgets out of builtins/ and into its own section under the language reference

docs/reference/src/language/widgets/standardlistview.md

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+## `StandardListView`
+
+Like ListView, but with a default delegate, and a `model` property which is a model of type
+[`StandardListViewItem`](../builtins/structs.md#standardlistviewitem).
+
+### Properties
+
+Same as [`ListView`](#listview), and in addition:
+
+-   **`current-item`** (_in-out_ _int_): The index of the currently active item. -1 mean none is selected, which is the default
+-   **`model`** (_in_ _[`StandardListViewItem`](../builtins/structs.md#standardlistviewitem)_): The model
+
+### Functions
+
+-   **`set-current-item(_index: int_)`**: Sets the current item and brings it into view
+
+### Callbacks
+
+-   **`current-item-changed(`_`int`_`)`**: Emitted when the current item has changed because the user modified it
+-   **`item-pointer-event(`_`index: int`_`, `_`event: PointerEvent`_`, `_`pos: Point`_`)`**: Emitted on any mouse pointer event similar to `TouchArea`. Arguments are item index associated with the event, the `PointerEvent` itself and the mouse position within the listview.
+
+### Example
+
+```slint
+import { StandardListView } from "std-widgets.slint";
+export component Example inherits Window {
+    width: 150px;
+    height: 150px;
+    StandardListView {
+        width: 150px;
+        height: 150px;
+        model: [ { text: "Blue"}, { text: "Red" }, { text: "Green" },
+            { text: "Yellow" }, { text: "Black"}, { text: "White"},
+            { text: "Magenta" }, { text: "Cyan" },
+        ];
+    }
+}
+```