Fix build path and add build instructions.
opcodes.yml: Define coordinates, position, and direction.
opcodes_generator.py: (un)serializeXXX should be static methods.
Fix Structure::serialize().
Remove Structure and Packet from opcodes.h.
Fix opcodes handling.
Fix packets serialization.
Use char* instead of std::string in packet serialization.
Merge branch 'develop' into feature/network
Edit opcodes_generator.py so it may now compile.