Improve avoiding enemies

[iam10k]

Currently the threshold for avoiding other snakes is any snake set at 1. To improve this in the future though snakes should scale their threshold based on their current size. So the larger the higher the threshold is. 1 is also overall a little to low. During testing with it, a threshold of 1.5-3 (just the ranges I tested at various sizes) works great with 3 being used while the snake is smaller and has a better turn radius and 1.5 being used when my snakes was around 8,000 in length.

I am going to work on an equation that could be used here. A linear equation should do the trick I think.