Add input output text metadata to process parts.
Add icons on the processing guide for inventory input/output.
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 branch 'iconRework' of github.com:skaldarnar/TerraTech into iconRework

Conflicts:
	assets/atlas/mechanicalPower.atlas
	assets/textures/mechanicalPower.png