Change size to be a Vectoe2f in TCPMessage

-Remove all double xSize, double ySize code
-Added Vector2f size, including getter/setter
-Changed size for << and >> opeartor
-Change code that used GetXSize() and GetYSize()
Moved TCPMessage setters/getters to cpp file.

-Moved setters and getters to TCPMessage.cpp
-Commited GetDir_YFlipped() that was written earlier, but not
added/commited