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/items/contents/CellConfig.java

@@ -27,7 +27,7 @@ import appeng.util.Platform;
 public class CellConfig extends AppEngInternalInventory
 {
 
-	final ItemStack is;
+	private final ItemStack is;
 
 	public CellConfig( final ItemStack is )
 	{

src/main/java/appeng/items/contents/CellUpgrades.java

@@ -26,7 +26,7 @@ import appeng.util.Platform;
 
 public final class CellUpgrades extends StackUpgradeInventory
 {
-	final ItemStack is;
+	private final ItemStack is;
 
 	public CellUpgrades( final ItemStack is, final int upgrades )
 	{

src/main/java/appeng/items/contents/NetworkToolViewer.java

@@ -32,9 +32,9 @@ import appeng.util.Platform;
 public class NetworkToolViewer implements INetworkTool
 {
 
-	final AppEngInternalInventory inv;
-	final ItemStack is;
-	final IGridHost gh;
+	private final AppEngInternalInventory inv;
+	private final ItemStack is;
+	private final IGridHost gh;
 
 	public NetworkToolViewer( final ItemStack is, final IGridHost gHost )
 	{

src/main/java/appeng/items/contents/QuartzKnifeObj.java

@@ -26,7 +26,7 @@ import appeng.api.implementations.guiobjects.IGuiItemObject;
 public class QuartzKnifeObj implements IGuiItemObject
 {
 
-	final ItemStack is;
+	private final ItemStack is;
 
 	public QuartzKnifeObj( final ItemStack o )
 	{