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/decorative/solid/QuartzGlassBlock.java

@@ -41,7 +41,7 @@ public class QuartzGlassBlock extends AEBaseBlock
 	{
 		super( Material.glass );
 		this.setLightOpacity( 0 );
-		this.isOpaque = false;
+		this.setOpaque( false );
 		this.setFeature( EnumSet.of( AEFeature.DecorativeQuartzBlocks ) );
 	}
 	

src/main/java/appeng/decorative/solid/QuartzOreBlock.java

@@ -175,12 +175,12 @@ public class QuartzOreBlock extends AEBaseBlock
 		}
 	}
 
-	public void setBoostBrightnessLow( final int boostBrightnessLow )
+	void setBoostBrightnessLow( final int boostBrightnessLow )
 	{
 		this.boostBrightnessLow = boostBrightnessLow;
 	}
 
-	public void setBoostBrightnessHigh( final int boostBrightnessHigh )
+	void setBoostBrightnessHigh( final int boostBrightnessHigh )
 	{
 		this.boostBrightnessHigh = boostBrightnessHigh;
 	}