Right-clicking with an item now by default places one as a stack
node. When placing this way, crafting detection applies.
Had to copy in a bit of code from builtin.
"Loose" versions of materials will only allow a certain maximum
angle of repose, and will shuffle around sideways and fall if
that angle is exceeded. Softer materials like sand, leaves, loose
items, will all have shallow angles, while sturdier stuff like
dirt, gravel, etc. may allow steeper ones.
- Need to search for open space for ents trapped inside a node.
- Look into a smoother way to handle the drops hack for the
stack node; maybe a central API with ext_drops supporting
functions?
