Martín Lombardo mlomb

Renamed 'Sensors' to 'Devices', to better reflect the abstraction (devices may have multiple sensors, ex: camera & IMU). Right now we are assuming a 1:1 relationship, but we want to future-proof.
Extracted the state machine of the sensors (now devices) into a new abstraction Lifecycle so it can be also shared with modules like recording, calibration, teleop.
Changed WebSocket communication to send messages to specific modules (by ID). This enables multiple instances of the same module (ex teleoperation)
Now leader-follower teleoperation is a module on itself: LeaderFollowerTeleop. It must be instantiated via config file (see config_sample.yaml)
Now app state is handled per module to reduce CPU usage.
Simplified Makefile for development (now make front and make back)
Reorganized the backend folder structure: now all modules live inside the modules/ folder, all the devices inside devices/ folder. Renamed short-names to be more explicit system_info.cpp -> system_info_module.cpp.

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