Add some additional image effect nodes (#869)

* Move the Subpath type to graphene-std

* Add the transform subpath node

* Delete selected nodes

* Inserting node list on right click

* Add several bitmap manipulator nodes

* Convert add node to use f64

* Add posterize node

* Rename names randomly

* Fix naming

* Exposure node

* Fix typo

* Adjust exposure node range

* Comment out vector nodes

* Adjust exposure range again

* Posterise as ints

* Rename input

* Use >= in the to hsl function

editor/src/messages/layout/utility_types/layout_widget.rs

@@ -263,6 +263,18 @@ impl WidgetHolder {
 	pub fn new(widget: Widget) -> Self {
 		Self { widget_id: generate_uuid(), widget }
 	}
+	pub fn unrelated_seperator() -> Self {
+		WidgetHolder::new(Widget::Separator(Separator {
+			separator_type: SeparatorType::Unrelated,
+			direction: SeparatorDirection::Horizontal,
+		}))
+	}
+	pub fn text_widget(text: impl Into<String>) -> Self {
+		WidgetHolder::new(Widget::TextLabel(TextLabel {
+			value: text.into(),
+			..Default::default()
+		}))
+	}
 }
 
 #[derive(Clone)]