Cleanup codebase

[SijmenHuizenga]

I am getting more and more annoyed by the big pile of unused code and the many layers of useless abstractions. This pr is the first that will try to cleanup the codebase. The goal is to make the codebase better accessible for new engineers. In this pr:

• remove in-game recording module. If people want to record the screen, use a screenrecorder. If you want to record thecamera views, use rosbag recordings
• Remove debug reporter as it is unused, nobody knows how it works and it is undocumented.
• Remove support for multiple gamemods. This simulation only does vehicle simulations so removed the computer vision simmode
• Remove VehicleType setting because it is and always will be PhysXCar
• Removed barometer and magnetometer sensors as they were all not used
• Removed 'environment' state as it was only useful for barometer and magnetometer
• Remove bitmap_image.hpp helper class and removed unused physics body classes
• Remove safety evaluation code as it was commented out and nobody knows what it does or how it can be usefull
• Remove unused drone physicsengine

[SijmenHuizenga]

I've tested this, everything still works so lets #merge