DBus Argument

• name - Argument name (optional)
• type - Argument type
• direction - Argument direction

struct @extern Eldbus.Introspection.Argument {
    name: stringshare;
    type: stringshare;
    direction: Eldbus.Introspection.Argument_Direction;
}

typedef struct _Eldbus_Introspection_Argument {
    Eina_Stringshare *name;
    Eina_Stringshare *type;
    Eldbus_Introspection_Argument_Direction direction;
} Eldbus_Introspection_Argument;