Added an image buffer to fix the artificial latency in sim #919
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We previously used time.sleep to simulate the latency, but this method slows down the whole loop.
I added an image/info buffer to fix this issue.
what it does:
If you have SIM_ARTIFICIAL_LATENCY=100, you should expect to have from 4 to 5 images in the buffer
tested on my machine with donkeycar in the sim