Add a "near" bias option

Hello all,

I’m always having to choose whether to bias diagrams left or right, and often neither is ideal.

If there are a bunch of input entities then it’s necessary to bias right; if there are a high quantity of output entities then its necessary to bias left. But when you have both input and output entities it would be helpful to have a bias option of “near”.

I requested this earlier this year: Bias to shortest for Left-Right layouts <3