Reworked item icons in 32x32px - resolves #9
  * reworked basic TerraTech icons
  * reworked iron work icons
  * reworked windmill (sail) cloth in different colors
  * Added windmillSail icon
  * WrappedWing and WingMesh icons
  * Added "WindmillCross" icon (4 arms)
Merge pull request #20 from skaldarnar/icons

Reworked item icons in 32x32px - resolves #9