Post-smoothing for straighter paths on flat terrain.

## Describe your suggestion
A simple post-smoothing step similar to the one in https://github.com/Ohohcakester/Any-Angle-Pathfinding/blob/7db6c32/src/algorithms/AStar.java#L183 may be added to straighten paths on flat terrain.

(The visibility check should pre check for identical y level for flat terrain. The "blocked" check is to be written as a check for both the ground to be a standard block and for the height to be non-blocked. A full weighted region problem involving soul sand and water is too complex for me think about.)

## Settings
Boolean switch for whether to smooth.

## Context
Baritone currently only produces paths in 45-degree increments for a total of 8 directions. Some paths can be made a tidbit shorter by going a bit straighter. This also mimic human movement more (although I don't think anyone ever seriously considers baritone passing as a human possible in like 2 years.)

## Final checklist
- [x] I know how to properly use check boxes
- [x] I have not used any OwO's or UwU's in this issue.