Use bezier curves on connection lines

[hnOsmium0001]

Polyline nodes (the ability to drag out multisegment control points) requires a lot of effort to configure for any given program, and introduces a lot of code complexity that I don't like. Bezier curves are very common in other visual scripting programs, and they generally look nicer than what we could have currently.

[hnOsmium0001]

Please give +1 if you like it, and -1 if you don't like it on this comment.