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>

graphene/src/document.rs

@@ -1,3 +1,4 @@
+use crate::consts::GRAPHENE_DOCUMENT_VERSION;
 use std::{
 	cmp::max,
 	collections::hash_map::DefaultHasher,
@@ -19,6 +20,7 @@ pub struct Document {
 	/// This identifier is not a hash and is not guaranteed to be equal for equivalent documents.
 	#[serde(skip)]
 	pub state_identifier: DefaultHasher,
+	pub graphene_document_version: String,
 }
 
 impl Default for Document {
@@ -26,6 +28,7 @@ impl Default for Document {
 		Self {
 			root: Layer::new(LayerDataType::Folder(Folder::default()), DAffine2::IDENTITY.to_cols_array()),
 			state_identifier: DefaultHasher::new(),
+			graphene_document_version: GRAPHENE_DOCUMENT_VERSION.to_string(),
 		}
 	}
 }