Desktop: Native export (#3188)

* Testing native export with raster convert implementation

* Jpg export

* Fix transparent export

* move texture conversion to runtime

* fixup

* move image encoding into editor export  function

* remove unused frontend message

* remove unused type

node-graph/gapplication-io/src/lib.rs

@@ -222,10 +222,6 @@ pub trait GetEditorPreferences {
 pub enum ExportFormat {
 	#[default]
 	Svg,
-	Png {
-		transparent: bool,
-	},
-	Jpeg,
 	Canvas,
 	Texture,
 }