haoqu.ma / gotty

* Move to TypeScript from legacy JavaScript
* Add support of xterm.js
* Hterm is still available for backward compatibility

Safari doesn't support basic authentication for websocket sessions.
This commit introduces a token-based authentication only for websocket
connection.
The token is shared by all clients and that might be not secure. However,
basic authentication itself is insecure and the credential is already
shared by clients, so don't mind.

Some terminal massages were shown at strange positions.