Implement IndexedDB document auto-save (#422)

* removed all use of document indicies

* -add u64 support for wasm bridge

* fixed rust formating

* Cleaned up FrontendDocumentState in js-messages

* Tiny tweaks from code review

* - moved more of closeDocumentWithConfirmation to rust
- updated serde_wasm_bindgen to add feature flag

* working initial auto save impl

* auto save is a lifetime file

* - cargo fmt
- fixc error message
- move document version constant

* code review round 1

* generate seed for uuid in js when wasm is initialized

* Resolve PR feedback

* Further address PR feedback

* Fix failing test

Co-authored-by: Keavon Chambers <keavon@keavon.com>
Co-authored-by: otdavies <oliver@psyfer.io>

editor/src/lib.rs

@@ -3,7 +3,7 @@
 
 extern crate graphite_proc_macros;
 
-mod communication;
+pub mod communication;
 #[macro_use]
 pub mod misc;
 pub mod consts;
@@ -31,6 +31,8 @@ pub struct Editor {
 }
 
 impl Editor {
+	/// Construct a new editor instance.
+	/// Remember to provide a random seed with `editor::communication::set_uuid_seed(seed)` before any editors can be used.
 	pub fn new() -> Self {
 		Self { dispatcher: Dispatcher::new() }
 	}