Refactor persistent data storage code and add button to wipe data on crash (#827)

* Organize persistence.ts

* Switch to simpler promise handling

* Switch document list storage from localStorage to IndexedDB

* Track document auto-save status to avoid re-auto-saving unnecessarily

* Add button to clear storage on crash

* Bump document version and test file

* Switch to IDB-Keyval instead of raw IDB transactions

editor/src/messages/frontend/utility_types.rs

@@ -3,6 +3,8 @@ use serde::{Deserialize, Serialize};
 
 #[derive(PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
 pub struct FrontendDocumentDetails {
+	#[serde(rename = "isAutoSaved")]
+	pub is_auto_saved: bool,
 	#[serde(rename = "isSaved")]
 	pub is_saved: bool,
 	pub name: String,