Deprecate IPocketAccess.getUpgrades

I think this left over from CCTweaks or Peripheral++. It doesn't really
make sense as an API - if/when we add multiple upgrades, we'll want a
different API for this.

projects/common-api/src/main/java/dan200/computercraft/api/pocket/IPocketAccess.java

@@ -80,7 +80,10 @@ public interface IPocketAccess {
     void updateUpgradeNBTData();
 
     /**
-     * Remove the current peripheral and create a new one. You may wish to do this if the methods available change.
+     * Remove the current peripheral and create a new one.
+     * <p>
+     * You may wish to do this if the methods available change, for instance when the {@linkplain #getEntity() owning
+     * entity} changes.
      */
     void invalidatePeripheral();
 
@@ -88,6 +91,8 @@ public interface IPocketAccess {
      * Get a list of all upgrades for the pocket computer.
      *
      * @return A collection of all upgrade names.
+     * @deprecated This is a relic of a previous API, which no longer makes sense with newer versions of ComputerCraft.
      */
+    @Deprecated(forRemoval = true)
     Map<ResourceLocation, IPeripheral> getUpgrades();
 }

projects/common/src/main/java/dan200/computercraft/shared/pocket/core/PocketServerComputer.java

@@ -104,6 +104,7 @@ public class PocketServerComputer extends ServerComputer implements IPocketAcces
     }
 
     @Override
+    @Deprecated(forRemoval = true)
     public Map<ResourceLocation, IPeripheral> getUpgrades() {
         return upgrade == null ? Collections.emptyMap() : Collections.singletonMap(upgrade.getUpgradeID(), getPeripheral(ComputerSide.BACK));
     }