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

Cargo.lock

@@ -2310,6 +2310,7 @@ dependencies = [
  "graph-craft",
  "graphene-std",
  "graphite-proc-macros",
+ "image",
  "interpreted-executor",
  "js-sys",
  "kurbo",