Small Handmade Stone Silo

Visual rework, new heap pile.
New manure storage version.

General TestRunner cleaneage, fixed various shaders issues.
Updated ModDesc version.
New screenshots and icons.

Quick fix, removed the leftover white plane used as a reference for the ground.

Raised discharging tube and unloading node.

Added storage for woodchips.

Added an unloading pipe with related effect.
More visually appealing.