simplify error messages

src/main/java/carpet/script/value/BlockValue.java

@@ -76,7 +76,7 @@ public class BlockValue extends Value
         catch (CommandSyntaxException ignored)
         {
         }
-        throw new ThrowStatement("Cannot parse block: "+str, Throwables.UNKNOWN_BLOCK);
+        throw new ThrowStatement(str, Throwables.UNKNOWN_BLOCK);
     }
 
     public static BlockPos locateBlockPos(CarpetContext c, int xpos, int ypos, int zpos)

src/main/java/carpet/script/value/NBTSerializableValue.java

@@ -299,7 +299,7 @@ public class NBTSerializableValue extends Value implements ContainerValueInterfa
         }
         catch (CommandSyntaxException e)
         {
-            throw new ThrowStatement("Incorrect item: "+itemString, Throwables.UNKNOWN_ITEM);
+            throw new ThrowStatement(itemString, Throwables.UNKNOWN_ITEM);
         }
     }
 

src/main/java/carpet/script/value/ValueConversions.java

@@ -160,7 +160,7 @@ public class ValueConversions
                         }
                     }
                     if (dim == null)
-                        throw new ThrowStatement("Incorrect dimension string: "+dimString, Throwables.UNKNOWN_DIMENSION);
+                        throw new ThrowStatement(dimString, Throwables.UNKNOWN_DIMENSION);
                     return server.getWorld(dim);
             }
         }