Remove unsafe code and clean up the code base in general (#1263)

* Remove unsafe code

* Make node graph test syncronous

* Add miri step to ci

* Remove unsafe from node graph evaluation

* Replace operation pseudo_hash with hash based on discriminant

* Fix test

* Move memo module to core and make it safe

* Fix formatting

* Remove unused stuff from gstd

* Use safe casting for creating key variants

* Fix memo node types

* Fix ref node

* "fix" ub

* Use correct input types for ExtractImageFrame

* Fix types for async nodes

* Fix missing implementation

* Manually override output type for async nodes

* Fix types for EditorApi

* Fix output type for WasmSurfaceHandle

* Remove unused miri.yml

* Fix incorrect type for cache node

editor/src/dispatcher.rs

@@ -323,6 +323,7 @@ mod test {
 	}
 
 	#[test]
+	#[cfg_attr(miri, ignore)]
 	/// - create rect, shape and ellipse
 	/// - select shape
 	/// - copy
@@ -362,6 +363,7 @@ mod test {
 	}
 
 	#[test]
+	#[cfg_attr(miri, ignore)]
 	fn copy_paste_folder() {
 		let mut editor = create_editor_with_three_layers();
 
@@ -450,6 +452,7 @@ mod test {
 	}
 
 	#[test]
+	#[cfg_attr(miri, ignore)]
 	/// - create rect, shape and ellipse
 	/// - select ellipse and rect
 	/// - copy