Reduces visibility of internal fields/methods

Reduces the visibility of all fields to private and create setters/getters
when necessary. Exceptions are fields with GuiSync as these need to be
public.

Reduces the visibility of internal methods to private/protected/default when possible.

src/main/java/appeng/block/AEBaseSlabBlock.java

@@ -63,7 +63,7 @@ public class AEBaseSlabBlock extends BlockSlab implements IAEFeature
 		this.features = !this.field_150004_a ? new SlabBlockFeatureHandler( features, this ) : null;
 	}
 
-	public AEBaseSlabBlock setSlabs( final AEBaseSlabBlock slabs )
+	private AEBaseSlabBlock setSlabs( final AEBaseSlabBlock slabs )
 	{
 		this.slabs = slabs;
 		return this;