refactor(network): replace manual size calculations with packed structs

Author: bobtista

GeneralsMD/Code/GameEngine/CMakeLists.txt

@@ -541,6 +541,7 @@ set(GAMEENGINE_SRC
     Include/GameNetwork/NetCommandRef.h
     Include/GameNetwork/NetCommandWrapperList.h
     Include/GameNetwork/NetPacket.h
+    Include/GameNetwork/NetPacketStructs.h
     Include/GameNetwork/NetworkDefs.h
     Include/GameNetwork/NetworkInterface.h
     Include/GameNetwork/networkutil.h