Gridlocks about egregoria

[Uriopass]

I had another idea on how to tackle this.

When a car stops, it displays it's id behind it, then displays the id shown on the car that blocks it.
Then, if a car sees it's own ID, it knows there's a cycle (and therefore a gridlock) and goes into panic mode and just drives through everything for a couple of seconds.

There are many ways to make this smoother, but this is the gist, and I'm pretty sure it should work. It shouldn't have any impact on performance too.

[Uriopass]

Implemented in e96cabe and it works very well :-) here's a video to show the three lock scenario being resolved and a more complicated example where lots of gridlocks appear and are resolved. (thanks github for supporting video!)

2021-01-10_13-05-15.mp4

You might probably think that the 3 grid lock is a bit disappointing because they all start at the same time and run over each other. But this is an artefact of the test since they all start stopped at the same time. In a real situation, some car will stop last and break the symmetry and only one car will start before the others.