New Feature: Illumination - add torch to fench post when using single layer excavation.

[DuelMonster]

in open areas, would it be possible to allow us to put it on top of a fence post if we had fences in our inventory? Similar to putting it up on the 2nd block in a shaft but instead of on a wall, it's on a fence when in open areas. Or possibly even allow for a village type lamppost if we got the resources for it in the inventory. Theoretically this would go well with the pathmaking function