Turn inspections up to 11

OK, so let's get this out of the way, there's some actual changes mixed
in here too. I'm really sorry:
 - Turtles can now not be renamed with unnamed item tags (previously it
   would clear the name, this seemed a little unideal).
 - commands.getBlock(s)Data will also include NBT.

Now, onto the horror story which is these inspection changes:
 - Make a lot of methods static
 - Typo fixes
 - Make utility classes final + private constructor
 - Lots of reformatting (ifs -> ternary, invert control flow, etc...)
 - ???
 - Profit!

I'm so going to regret this - can pretty much guarantee this is going to
break something.

src/main/java/dan200/computercraft/client/render/TurtleModelLoader.java

@@ -21,7 +21,7 @@ import net.minecraftforge.common.model.IModelState;
 import javax.annotation.Nonnull;
 import java.util.function.Function;
 
-public class TurtleModelLoader implements ICustomModelLoader
+public final class TurtleModelLoader implements ICustomModelLoader
 {
     private static final ResourceLocation NORMAL_TURTLE_MODEL = new ResourceLocation( ComputerCraft.MOD_ID, "block/turtle" );
     private static final ResourceLocation ADVANCED_TURTLE_MODEL = new ResourceLocation( ComputerCraft.MOD_ID, "block/advanced_turtle" );
@@ -64,7 +64,7 @@ public class TurtleModelLoader implements ICustomModelLoader
         throw new IllegalStateException( "Loader does not accept " + name );
     }
 
-    private static class TurtleModel implements IModel
+    private static final class TurtleModel implements IModel
     {
         private final IModel family;
         private final IModel colour;