Mac app for receiving data from Neo smartpen N2 (NWP-F110) via bluetooth

* PenLib: Mac lib based on from https://github.com/NeoSmartpen/IOS-SDK2.0/commit/b745657e59faa11a930329f8189e0b03b9a700be
* PenTest: Websocket Server that forwards pen data + web server with test client (uses PenLib)