Re-activate or remove disabled components

Some components and core modules have been disabled in the build (maybe by accident) for quite some time now. See CMakeLists.txt here and here. Looks like I commited that change myself 3 years ago 😝

The affected components:

• Core modules
  • CollisionDetection
  • Observation_State
  • Observation_Ttc
  • SpawnPoint_Start
• Components
  • Action_BrakeLight_Basic
  • Algorithm_CruiseControlByDistance
  • Sensor_Distance
  • Dynamics_Longitudinal_Basic

All (or most) of them currently do not compile due to changes in include hierarchies and in interfaces (e.g. the AgentInterface).

As there haven't been any issues reported up to now, I wonder if anybody is still using these components. If yes, we have to re-activate and fix them. If no, we should consider removing them.

@tplatzer @adascri @jdobberstein