Beutify debug print

[giulioturrisi]

Hello, I have some difficulty understanding what's happening during startup, e.g. i have the following print every time:

Stance Detection Module constructed
25-12-18_09.50.09: INFO: process_launcher: Loaded component stance_detection
25-12-18_09.50.09: WARN: stance_detection: Missing inputs: blind_state

25-12-18_09.50.10: INFO: process_launcher: Loaded component leg_odometry
25-12-18_09.50.11: WARN: leg_odometry: Missing inputs: attitude_estimation blind_state stance_status

25-12-18_09.50.11: INFO: process_launcher: Loaded component sensor_fusion
25-12-18_09.50.12: WARN: sensor_fusion: Missing inputs: imu attitude_estimation stance_status legs_pose

UDP Initialized. Port: 8080
25-12-18_09.50.12: INFO: process_launcher: Loaded component aliengo_hal
25-12-18_09.50.13: WARN: aliengo_hal: Missing inputs: trajectory_generator
While waiting for activation, the aliengo hal publishes the robot state
25-12-18_09.50.13: WARN: sensor_fusion: Missing inputs: attitude_estimation stance_status legs_pose

25-12-18_09.50.13: WARN: leg_odometry: Missing inputs: attitude_estimation stance_status

25-12-18_09.50.14: WARN: sensor_fusion: Missing inputs: legs_pose

Command aliengo_hal::loadModel not found

But everything start normally. It's a bit controintuitive i think since WARN seems saying that something is off. I understand these are temporary warning that are solved later when topics appear, but for debugging to see if everything is working i always have a look at ros2 topic list, hence this print does not help me really at all.

A solution would be just print STANCE_DETECTION Module OK, or something similar

cc @MMarcus95 @sven1904