Deprecate ActuallyItem and DrillAugmentItem

They both have replacements and are unused

src/main/java/de/ellpeck/actuallyadditions/mod/items/base/ActuallyItem.java

@@ -6,6 +6,8 @@ import net.minecraft.world.item.Item;
  * I'm using a custom class here as I'm sure we'll need a unified way of declaring rules
  * but also so we can always know if something is ours in the simplest form.
  */
+// Superseded by ItemBase
+@Deprecated
 public abstract class ActuallyItem extends Item implements IActuallyItem {
     public ActuallyItem(Properties properties) {
         super(properties);

src/main/java/de/ellpeck/actuallyadditions/mod/items/misc/DrillAugmentItem.java

@@ -3,6 +3,8 @@ package de.ellpeck.actuallyadditions.mod.items.misc;
 
 import de.ellpeck.actuallyadditions.mod.items.base.ActuallyItem;
 
+// Superseded by ItemDrillUpgrade
+@Deprecated
 public class DrillAugmentItem extends ActuallyItem {
     private final AugmentType type;