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/core/Registration.java

@@ -129,7 +129,7 @@ public final class Registration
 		return this.storageBiome;
 	}
 
-	public void preInitialize( final FMLPreInitializationEvent event )
+	void preInitialize( final FMLPreInitializationEvent event )
 	{
 		this.registerSpatial( false );
 
@@ -315,7 +315,7 @@ public final class Registration
 		}
 	}
 
-	public void postInit( final FMLPostInitializationEvent event )
+	void postInit( final FMLPostInitializationEvent event )
 	{
 		this.registerSpatial( true );