Show a crash dialog when the editor panics (#362)

* Show a crash dialog when the editor panics

Closes #357

* Suppress console usage lints

* Proxy cleanup and comments

editor/src/document/document_message_handler.rs

@@ -202,7 +202,13 @@ impl MessageHandler<DocumentsMessage, &InputPreprocessor> for DocumentsMessageHa
 					Ok(document) => {
 						self.load_document(document, responses);
 					}
-					Err(e) => responses.push_back(FrontendMessage::DisplayError { description: e.to_string() }.into()),
+					Err(e) => responses.push_back(
+						FrontendMessage::DisplayError {
+							title: "Failed to open document".to_string(),
+							description: e.to_string(),
+						}
+						.into(),
+					),
 				}
 			}
 			GetOpenDocumentsList => {