Rosserial client var typedef

[mikeodr]

Updating message generation to provide a typedef for each message variable.
This allows for rosserial client applications to define a size/type variable to match that of a message.

This is already present in roscpp message headers.

An example of the newly generated typedefs in the message header:

  class Status : public ros::Msg
  {
    public:
      typedef std_msgs::Header _header_type;
      _header_type header;
      typedef const char* _hardware_id_type;
      _hardware_id_type hardware_id;
      typedef ros::Duration _mcu_uptime_type;
      _mcu_uptime_type mcu_uptime;
      typedef ros::Duration _connection_uptime_type;
      _connection_uptime_type connection_uptime;
      typedef float _pcb_temperature_type;
      _pcb_temperature_type pcb_temperature;
      typedef float _mcu_temperature_type;
      _mcu_temperature_type mcu_temperature;
      typedef float _battery_temperature_type;
      _battery_temperature_type battery_temperature;
      typedef uint16_t _stop_type;
      _stop_type stop;
      typedef float _measured_battery_type;
      _measured_battery_type measured_battery;
      typedef float _measured_12v_type;
      _measured_12v_type measured_12v;
      typedef float _measured_5v_type;
      _measured_5v_type measured_5v;
      typedef float _drive_current_type;
      _drive_current_type drive_current;
      typedef float _user_current_type;
      _user_current_type user_current;
      typedef float _computer_current_type;
      _computer_current_type computer_current;
      typedef float _total_current_type;
      _total_current_type total_current;
      uint32_t foo_length;
      typedef float _foo_type;
      _foo_type st_foo;
      _foo_type * foo;

[mikeodr]

To note: I used the same typedef naming syntax as roscpp for consistency, happy to modify if needed.

[mikeodr]

@mikepurvis FYI.

[mikepurvis]

Thanks for adding the array example; that's the one I was primarily concerned about.