Changed Commands to GetCommands, so this gets input from the user/pilot.

Added a SendCommands to send commands to the aircraft (AC).
I thought we'd send commands as packets with hex IDs, so I made a 0x01 to send the commands, and a 0x02 to receive data.
Added a GetAcData to receive aircraft (AC) data, but it doesn't work yet. I think it has to do with the asynchronous I/O. I think I opened the port incorrectly, but need to look at it more. When I send data from one computer to another, I recieve with HyperTerm, which just prints out the ASCII string.

Also, the stdint.h from the KalmanIMU project didn't give me the sizes I was expecting. When I used KalmanIMU.h's uint16_t, I found that I ended up with a uint32_t. That's because uint16_t was being defined as int, which I think depends on the compiler, and it must be that Microsoft's cl.exe compiler sets int to 32 bits. Good to know. So, I adjusted things a bit and gave it a slightly different name. Might be that we should just use 1 file with a #define to figure out what compiler is being used, or look for a flag.