A whole bunch of refomatting

- Remove redundant constructors and super calls
 - Standardise naming of texture fields
 - Always use postfix notations for loops
 - Cleanup several peripheral classes

src/main/java/dan200/computercraft/client/gui/FixedWidthFontRenderer.java

@@ -35,7 +35,7 @@ public class FixedWidthFontRenderer
         return instance = new FixedWidthFontRenderer();
     }
 
-    private TextureManager m_textureManager;
+    private final TextureManager m_textureManager;
 
     private FixedWidthFontRenderer()
     {