Update to latest Forge

- Lots of refactoring/cleanup to Forge's events and client APIs.
   - Render types/layers for blocks are now set on the model rather than
     in code.

   - Models now can work with multiple render types. As this would
     massively complicate the implementation of the turtle item model, we
     now implement a much simpler version, which makes use of Forge's
     BakedModel.getRenderPasses to return a separate model for the core
     turtle and each upgrade.

 - Send monitor contents to players immediately when they start watching
   the chunk. ChunkWatchEvent.Watch is now fired from a more sensible
   location, so this is much easier to implement!

src/main/java/dan200/computercraft/shared/Config.java

@@ -6,8 +6,6 @@
 package dan200.computercraft.shared;
 
 import com.electronwill.nightconfig.core.UnmodifiableConfig;
-import com.google.common.base.CaseFormat;
-import com.google.common.base.Converter;
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.core.apis.http.NetworkUtils;
 import dan200.computercraft.core.apis.http.options.Action;
@@ -367,6 +365,4 @@ public final class Config
     {
         sync( event.getConfig() );
     }
-
-    private static final Converter<String, String> converter = CaseFormat.LOWER_CAMEL.converterTo( CaseFormat.UPPER_UNDERSCORE );
 }