Normalise enums to use SHOUTY_CASE

PascalCase is more .NET than Java

src/main/java/dan200/computercraft/api/turtle/TurtleVerb.java

@@ -19,10 +19,10 @@ public enum TurtleVerb
     /**
      * The turtle called {@code turtle.dig()}, {@code turtle.digUp()} or {@code turtle.digDown()}.
      */
-    Dig,
+    DIG,
 
     /**
      * The turtle called {@code turtle.attack()}, {@code turtle.attackUp()} or {@code turtle.attackDown()}.
      */
-    Attack,
+    ATTACK,
 }