Tick data server

Code written for MT4 must:

1. Open a keep-alive socket connection to a server and port specified in settings.

2. Accept a request from the server:

Format: <SubscribeRealTimeTicks EURUSD GBPUSD ...>

3. Respond to the request by continually sending real-time ticks down the socket.

Format: <Tick Instrument Timestamp Bid Ask>

4. Accept a request from the server:

Format: <HistoricalTicksRequest Instrument FromDate>

5. Respond to the request by sending all the stored historical ticks down the socket.

Format: <HistoricalTicks Instrument FromDate <Timestamp Bid Ask> <Timestamp Bid Ask> <Timestamp Bid Ask> <Timestamp Bid Ask> .... >

6. Notify the server of MT4 account connection / disconnection

Format: <MT4 Connected> <MT4 Disconnected>