Detect and visualize nearby cars, cyclists, and pedestrians

[wheitman]

Problem

Currently, the car cannot detect and visualize nearby cars, cyclists, or pedestrians.

Solution

Use the ZED SDK, @zzeneric 's visualization code, and @rae0924 's interface to detect and visualize these three obstacle classes in real time.

The visualization should convey each obstacle's type, relative position and velocity in real time. Beyond this, the design of the interface should be left to @zzeneric 's discretion.

Success condition

Nearby obstacles detected by the ZED SDK are visualized in real time, alongside Checkpoint C (#137).

For testing, the SVO files available in /home/share/bags can be used. However, these files do not necessarily contain many moving obstacles. For final tests, we can have lab members on foot and on bikes walk around the car.