Gracefully handle OneDrive account password change (#73)

* Gracefully handle OneDrive account password change rather than crashing if authorization token is now invalid

src/main.d

@@ -192,7 +192,17 @@ int main(string[] args)
 	// Initialise the sync engine
 	log.log("Initializing the Synchronization Engine ...");
 	auto sync = new SyncEngine(cfg, onedrive, itemdb, selectiveSync);
-	sync.init();
+	
+	try {
+		sync.init();
+	} catch (OneDriveException e) {
+		if (e.httpStatusCode == 400 || e.httpStatusCode == 401) {
+			// Authorization is invalid
+			log.log("\nAuthorization token invalid, use --logout to authorize the client again\n");
+			onedrive.http.shutdown();
+			return EXIT_FAILURE;
+		}
+	}
 	
 	// Do we need to validate the syncDir to check for the presence of a '.nosync' file
 	if (checkMount) {

src/onedrive.d

@@ -294,7 +294,6 @@ final class OneDriveApi
 			if (e.httpStatusCode == 400 || e.httpStatusCode == 401) {
 				e.msg ~= "\nRefresh token invalid, use --logout to authorize the client again";
 			}
-			throw e;
 		}
 	}