Implement anchor and handle point rendering with the Path Tool (#353)

* Implement Path Tool

* Draw a red rectangle where the first point on the shape is

* Correctly render anchors, handles, and connecting lines

* Fix drain() which can panic

* Refactor frontend messages to work as return values not callbacks

* Reduce the number of unnecessary frontend updates

* Fix stack overflow by using a loop

* Group Document Render calls and put them at the end

* Speed hacks for dirtification

* Add performance

* Bunch folder changed updates

* Add triggers to redraw overlays to movement_handler

* Polish the pixel-perfect rendering of vector manipulators

* Restore scrollbars that were disabled

* Cleanup

* WIP Add shape outline rendering

* Fix compiling

* Add outlines to selected shapes

* Fix outlines rendering over handles and anchors

* Fix dirtification

* Add a comment

* Address code review feedback

* Formatting

* Small tweaks

Co-authored-by: Oliver Davies <oliver@psyfer.io>
Co-authored-by: Dennis Kobert <dennis@kobert.dev>

editor/src/input/input_preprocessor.rs

@@ -7,9 +7,10 @@ use bitflags::bitflags;
 
 #[doc(inline)]
 pub use graphene::DocumentResponse;
+use serde::{Deserialize, Serialize};
 
 #[impl_message(Message, InputPreprocessor)]
-#[derive(PartialEq, Clone, Debug)]
+#[derive(PartialEq, Clone, Debug, Serialize, Deserialize)]
 pub enum InputPreprocessorMessage {
 	MouseDown(EditorMouseState, ModifierKeys),
 	MouseUp(EditorMouseState, ModifierKeys),
@@ -21,7 +22,7 @@ pub enum InputPreprocessorMessage {
 }
 
 bitflags! {
-	#[derive(Default)]
+	#[derive(Default, Serialize, Deserialize)]
 	#[repr(transparent)]
 	pub struct ModifierKeys: u8 {
 		const CONTROL = 0b0000_0001;