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/tile/networking/TileDenseEnergyCell.java

@@ -24,6 +24,6 @@ public class TileDenseEnergyCell extends TileEnergyCell
 
 	public TileDenseEnergyCell()
 	{
-		this.internalMaxPower = 200000 * 8;
+		this.setInternalMaxPower( 200000 * 8 );
 	}
 }